Re: [Tarantool-patches] [sergepetrenko@tarantool.org: Re: [PATCH v1] Divide replication/mist.test.lua]

[Serge Petrenko <sergepetrenko@tarantool.org>]

03.09.2020 12:32, Sergey Bronnikov пишет:
> Hi,
>
> I remember that we already discussed naming format for regression 
> tests when
>
> Alexander sent patches for box/net.box [1] and decided to add gh issue 
> number as a postfix to the name.
>
> BTW, ddl.test.lua was splitted to the tests with gh issue number as a 
> postfix - [2].
>
>
> 1. 
> https://lists.tarantool.org/pipermail/tarantool-patches/2020-April/015355.html
>
> 2. 
> https://github.com/tarantool/tarantool/commit/4a8d1ebda3e0eb7b7d6d14f66b77a9c6d8d0815e


Ok, I see. I'm ok with it then.

>
> On 03.09.2020 10:54, Alexander V. Tikhonov wrote:
>> Hi Sergey, could you please confirm the the new tests style used
>> in dividing box/net.box*.test.lua test.
>>
>>
>> ----- Forwarded message from Serge Petrenko 
>> <sergepetrenko@tarantool.org> -----
>>
>> Date: Thu, 3 Sep 2020 10:45:17 +0300
>> From: Serge Petrenko <sergepetrenko@tarantool.org>
>> To: "Alexander V. Tikhonov" <avtikhon@tarantool.org>
>> Cc: Mergen Imeev <imeevma@gmail.com>, 
>> tarantool-patches@dev.tarantool.org, Alexander Turenko 
>> <alexander.turenko@tarantool.org>, Yukhin Kirill <k.yukhin@corp.mail.ru>
>> Subject: Re: [Tarantool-patches] [PATCH v1] Divide 
>> replication/mist.test.lua
>> User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) 
>> Gecko/20100101 Thunderbird/68.12.0
>>
>>
>> 02.09.2020 13:08, Alexander V. Tikhonov пишет:
>>> Hi Sergey, thanks for the review. The major comment on tests naming
>>> that it was discussed during fixes in issue [1], and decided to use
>>> this naming format, check as an example of it with:
>>>
>>>     ls -al test/box/net.box*.test.lua
>>>
>>> [1] - https://github.com/tarantool/tarantool/issues/4880
>> Hi, Alex!
>>
>> Strange. I was guided by our earlier decision and replication tests:
>>
>> ls test/replication/gh-*.test.lua
>> test/replication/gh-4114-local-space-replication.test.lua
>> test/replication/gh-4402-info-errno.test.lua
>> test/replication/gh-4605-empty-password.test.lua
>> test/replication/gh-4606-admin-creds.test.lua
>> test/replication/gh-4729-netbox-group-id.test.lua
>> test/replication/gh-4730-applier-rollback.test.lua
>> test/replication/gh-4739-vclock-assert.test.lua
>> test/replication/gh-4928-tx-boundaries.test.lua
>> test/replication/gh-5140-qsync-casc-rollback.test.lua
>> test/replication/gh-5144-qsync-dup-confirm.test.lua
>> test/replication/gh-5163-qsync-restart-crash.test.lua
>> test/replication/gh-5167-qsync-rollback-snap.test.lua
>> test/replication/gh-5195-qsync-replica-write.test.lua
>>
>> Anyway, if someone can confirm that we're using another naming
>> scheme now, I'm ok with it.
>>
>>> On Wed, Sep 02, 2020 at 11:09:30AM +0300, Serge Petrenko wrote:
>>>> Hi! Thanks for the patch!
>>>>
>>>> Please see my comments below.
>>>>
>>>> 17.07.2020 12:25, Alexander V. Tikhonov пишет:
>>>>> To fix flaky issues of replication/misc.test.lua the test had to be
>>>>> divided into smaller tests to be able to localize the flaky results:
>>>>>
>>>>>      misc_assert_connecting_master_twice_gh-3610.test.lua
>>>>>      misc_assert_on_server_die_gh-2991.test.lua
>>>>> misc_assert_replica_on_applier_disconnect_gh-3510.test.lua
>>>>>      misc_crash_on_box_concurrent_update_gh-3606.test.lua
>>>>>      misc_heartbeats_on_master_changes_gh-3160.test.lua
>>>>>      misc_no_failure_on_error_reading_wal_gh-4399.test.lua
>>>>>      misc_no_panic_on_connected_gh-3637.test.lua
>>>>> misc_no_restart_on_same_configuration_gh-3711.test.lua
>>>>> misc_no_socket_leak_on_replica_disconnect_gh-3642.test.lua
>>>>>      misc_orphan_on_reconfiguration_error_gh-4424.test.lua
>>>>>      misc_rebootstrap_from_ro_master_gh-3111.test.lua
>>>>>      misc_replica_checks_cluster_id_gh-3704.test.lua
>>>>>      misc_return_on_quorum_0_gh-3760.test.lua
>>>>> misc_value_not_replicated_on_iproto_request_gh-3247.test.lua
>>>> We use a different naming scheme for regression tests.
>>>> It should be `gh-xxxx-bug-description`, also notice the dashes
>>>> between words instead of the underscores.
>>>>
>>>>> Needed for #4940
>>>>> ---
>>>>>
>>>>> Github: 
>>>>> https://github.com/tarantool/tarantool/tree/avtikhon/gh-4940-replication-misc
>>>>> Issue: https://github.com/tarantool/tarantool/issues/4940
>>>>>
>>>>>     test/replication/misc.result                  | 866 
>>>>> ------------------
>>>>>     test/replication/misc.test.lua                | 356 -------
>>>>>     ...ert_connecting_master_twice_gh-3610.result |  86 ++
>>>>>     ...t_connecting_master_twice_gh-3610.test.lua |  34 +
>>>>>     .../misc_assert_on_server_die_gh-2991.result  |  31 +
>>>>>     ...misc_assert_on_server_die_gh-2991.test.lua |  12 +
>>>>>     ...plica_on_applier_disconnect_gh-3510.result |  49 +
>>>>>     ...ica_on_applier_disconnect_gh-3510.test.lua |  17 +
>>>>>     ...sh_on_box_concurrent_update_gh-3606.result |  50 +
>>>>>     ..._on_box_concurrent_update_gh-3606.test.lua |  19 +
>>>>>     ...eartbeats_on_master_changes_gh-3160.result |  76 ++
>>>>>     ...rtbeats_on_master_changes_gh-3160.test.lua |  40 +
>>>>>     ...ailure_on_error_reading_wal_gh-4399.result |  97 ++
>>>>>     ...lure_on_error_reading_wal_gh-4399.test.lua |  39 +
>>>>>     .../misc_no_panic_on_connected_gh-3637.result |  72 ++
>>>>>     ...isc_no_panic_on_connected_gh-3637.test.lua |  33 +
>>>>>     ...start_on_same_configuration_gh-3711.result | 107 +++
>>>>>     ...art_on_same_configuration_gh-3711.test.lua |  41 +
>>>>>     ..._leak_on_replica_disconnect_gh-3642.result |  98 ++
>>>>>     ...eak_on_replica_disconnect_gh-3642.test.lua |  44 +
>>>>>     ...an_on_reconfiguration_error_gh-4424.result |  88 ++
>>>>>     ..._on_reconfiguration_error_gh-4424.test.lua |  37 +
>>>>>     ..._rebootstrap_from_ro_master_gh-3111.result |  58 ++
>>>>>     ...ebootstrap_from_ro_master_gh-3111.test.lua |  20 +
>>>>>     ...c_replica_checks_cluster_id_gh-3704.result |  71 ++
>>>>>     ...replica_checks_cluster_id_gh-3704.test.lua |  26 +
>>>>>     .../misc_return_on_quorum_0_gh-3760.result    |  48 +
>>>>>     .../misc_return_on_quorum_0_gh-3760.test.lua  |  27 +
>>>>>     ...eplicated_on_iproto_request_gh-3247.result |  90 ++
>>>>>     ...licated_on_iproto_request_gh-3247.test.lua |  33 +
>>>>>     test/replication/suite.cfg                    |  15 +-
>>>>>     31 files changed, 1457 insertions(+), 1223 deletions(-)
>>>>>     delete mode 100644 test/replication/misc.result
>>>>>     delete mode 100644 test/replication/misc.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_assert_connecting_master_twice_gh-3610.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_assert_connecting_master_twice_gh-3610.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_assert_on_server_die_gh-2991.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_assert_on_server_die_gh-2991.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_crash_on_box_concurrent_update_gh-3606.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_crash_on_box_concurrent_update_gh-3606.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_heartbeats_on_master_changes_gh-3160.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_heartbeats_on_master_changes_gh-3160.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_failure_on_error_reading_wal_gh-4399.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_failure_on_error_reading_wal_gh-4399.test.lua 
>>>>>
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_panic_on_connected_gh-3637.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_panic_on_connected_gh-3637.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_restart_on_same_configuration_gh-3711.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_restart_on_same_configuration_gh-3711.test.lua 
>>>>>
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_orphan_on_reconfiguration_error_gh-4424.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_orphan_on_reconfiguration_error_gh-4424.test.lua 
>>>>>
>>>>>     create mode 100644 
>>>>> test/replication/misc_rebootstrap_from_ro_master_gh-3111.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_rebootstrap_from_ro_master_gh-3111.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_replica_checks_cluster_id_gh-3704.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_replica_checks_cluster_id_gh-3704.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_return_on_quorum_0_gh-3760.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_return_on_quorum_0_gh-3760.test.lua
>>>>>     create mode 100644 
>>>>> test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.result
>>>>>     create mode 100644 
>>>>> test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.test.lua
>>>>>
>>>>> diff --git a/test/replication/misc.result 
>>>>> b/test/replication/misc.result
>>>>> deleted file mode 100644
>>>>> index e5d1f560e..000000000
>>>>> --- a/test/replication/misc.result
>>>>> +++ /dev/null
>>>>> @@ -1,866 +0,0 @@
>>>>> -uuid = require('uuid')
>>>>> ----
>>>>> -...
>>>>> -test_run = require('test_run').new()
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> --- gh-2991 - Tarantool asserts on box.cfg.replication update if 
>>>>> one of
>>>>> --- servers is dead
>>>>> -replication_timeout = box.cfg.replication_timeout
>>>>> ----
>>>>> -...
>>>>> -replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication_timeout=0.05, 
>>>>> replication_connect_timeout=0.05, replication={}}
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication_connect_quorum=2}
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication = {'127.0.0.1:12345', box.cfg.listen}}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- orphan
>>>>> -...
>>>>> -box.info.ro
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- gh-3606 - Tarantool crashes if box.cfg.replication is updated 
>>>>> concurrently
>>>>> -fiber = require('fiber')
>>>>> ----
>>>>> -...
>>>>> -c = fiber.channel(2)
>>>>> ----
>>>>> -...
>>>>> -f = function() fiber.create(function() pcall(box.cfg, 
>>>>> {replication = {12345}}) c:put(true) end) end
>>>>> ----
>>>>> -...
>>>>> -f()
>>>>> ----
>>>>> -...
>>>>> -f()
>>>>> ----
>>>>> -...
>>>>> -c:get()
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -c:get()
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{replication = "", replication_timeout = 
>>>>> replication_timeout, replication_connect_timeout = 
>>>>> replication_connect_timeout}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- running
>>>>> -...
>>>>> -box.info.ro
>>>>> ----
>>>>> -- false
>>>>> -...
>>>>> --- gh-3111 - Allow to rebootstrap a replica from a read-only master
>>>>> -replica_uuid = uuid.new()
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd('create server test with rpl_master=default, 
>>>>> script="replication/replica_uuid.lua"')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('stop server test')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('cleanup server test')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{read_only = true}
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('stop server test')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('cleanup server test')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{read_only = false}
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd('delete server test')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> --- gh-3160 - Send heartbeats if there are changes from a remote 
>>>>> master only
>>>>> -SERVERS = { 'autobootstrap1', 'autobootstrap2', 'autobootstrap3' }
>>>>> ----
>>>>> -...
>>>>> --- Deploy a cluster.
>>>>> -test_run:create_cluster(SERVERS, "replication", {args="0.03"})
>>>>> ----
>>>>> -...
>>>>> -test_run:wait_fullmesh(SERVERS)
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch autobootstrap3")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run = require('test_run').new()
>>>>> ----
>>>>> -...
>>>>> -fiber = require('fiber')
>>>>> ----
>>>>> -...
>>>>> -_ = box.schema.space.create('test_timeout'):create_index('pk')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("setopt delimiter ';'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -function wait_not_follow(replicaA, replicaB)
>>>>> -    return test_run:wait_cond(function()
>>>>> -        return replicaA.status ~= 'follow' or replicaB.status ~= 
>>>>> 'follow'
>>>>> -    end, box.cfg.replication_timeout)
>>>>> -end;
>>>>> ----
>>>>> -...
>>>>> -function test_timeout()
>>>>> -    local replicaA = box.info.replication[1].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> -    local replicaB = box.info.replication[3].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> -    local follows = test_run:wait_cond(function()
>>>>> -        return replicaA.status == 'follow' or replicaB.status == 
>>>>> 'follow'
>>>>> -    end)
>>>>> -    if not follows then error('replicas are not in the follow 
>>>>> status') end
>>>>> -    for i = 0, 99 do
>>>>> -        box.space.test_timeout:replace({1})
>>>>> -        if wait_not_follow(replicaA, replicaB) then
>>>>> -            return error(box.info.replication)
>>>>> -        end
>>>>> -    end
>>>>> -    return true
>>>>> -end;
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("setopt delimiter ''");
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_timeout()
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- gh-3247 - Sequence-generated value is not replicated in case
>>>>> --- the request was sent via iproto.
>>>>> -test_run:cmd("switch autobootstrap1")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -net_box = require('net.box')
>>>>> ----
>>>>> -...
>>>>> -_ = box.schema.space.create('space1')
>>>>> ----
>>>>> -...
>>>>> -_ = box.schema.sequence.create('seq')
>>>>> ----
>>>>> -...
>>>>> -_ = box.space.space1:create_index('primary', {sequence = true} )
>>>>> ----
>>>>> -...
>>>>> -_ = box.space.space1:create_index('secondary', {parts = {2, 
>>>>> 'unsigned'}})
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.grant('guest', 'read,write', 'space', 'space1')
>>>>> ----
>>>>> -...
>>>>> -c = net_box.connect(box.cfg.listen)
>>>>> ----
>>>>> -...
>>>>> -c.space.space1:insert{box.NULL, "data"} -- fails, but bumps 
>>>>> sequence value
>>>>> ----
>>>>> -- error: 'Tuple field 2 type does not match one required by 
>>>>> operation: expected unsigned'
>>>>> -...
>>>>> -c.space.space1:insert{box.NULL, 1, "data"}
>>>>> ----
>>>>> -- [2, 1, 'data']
>>>>> -...
>>>>> -box.space.space1:select{}
>>>>> ----
>>>>> -- - [2, 1, 'data']
>>>>> -...
>>>>> -vclock = test_run:get_vclock("autobootstrap1")
>>>>> ----
>>>>> -...
>>>>> -vclock[0] = nil
>>>>> ----
>>>>> -...
>>>>> -_ = test_run:wait_vclock("autobootstrap2", vclock)
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch autobootstrap2")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.space.space1:select{}
>>>>> ----
>>>>> -- - [2, 1, 'data']
>>>>> -...
>>>>> -test_run:cmd("switch autobootstrap1")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.space.space1:drop()
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:drop_cluster(SERVERS)
>>>>> ----
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> --- gh-3642 - Check that socket file descriptor doesn't leak
>>>>> --- when a replica is disconnected.
>>>>> -rlimit = require('rlimit')
>>>>> ----
>>>>> -...
>>>>> -lim = rlimit.limit()
>>>>> ----
>>>>> -...
>>>>> -rlimit.getrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> ----
>>>>> -...
>>>>> -old_fno = lim.rlim_cur
>>>>> ----
>>>>> -...
>>>>> -lim.rlim_cur = 64
>>>>> ----
>>>>> -...
>>>>> -rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd('create server sock with rpl_master=default, 
>>>>> script="replication/replica.lua"')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('start server sock')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('switch sock')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run = require('test_run').new()
>>>>> ----
>>>>> -...
>>>>> -fiber = require('fiber')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("setopt delimiter ';'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -for i = 1, 64 do
>>>>> -    local replication = box.cfg.replication
>>>>> -    box.cfg{replication = {}}
>>>>> -    box.cfg{replication = replication}
>>>>> -    while box.info.replication[1].upstream.status ~= 'follow' do
>>>>> -        fiber.sleep(0.001)
>>>>> -    end
>>>>> -end;
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("setopt delimiter ''");
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.info.replication[1].upstream.status
>>>>> ----
>>>>> -- follow
>>>>> -...
>>>>> -test_run:cmd('switch default')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -lim.rlim_cur = old_fno
>>>>> ----
>>>>> -...
>>>>> -rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("stop server sock")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("cleanup server sock")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("delete server sock")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> --- gh-3510 assertion failure in replica_on_applier_disconnect()
>>>>> -test_run:cmd('create server er_load1 with 
>>>>> script="replication/er_load1.lua"')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('create server er_load2 with 
>>>>> script="replication/er_load2.lua"')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('start server er_load1 with wait=False, 
>>>>> wait_load=False')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- Instance er_load2 will fail with error 
>>>>> ER_REPLICASET_UUID_MISMATCH.
>>>>> --- This is OK since we only test here that er_load1 doesn't assert.
>>>>> -test_run:cmd('start server er_load2 with wait=True, 
>>>>> wait_load=True, crash_expected = True')
>>>>> ----
>>>>> -- false
>>>>> -...
>>>>> -test_run:cmd('stop server er_load1')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- er_load2 exits automatically.
>>>>> -test_run:cmd('cleanup server er_load1')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('cleanup server er_load2')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('delete server er_load1')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd('delete server er_load2')
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> ---
>>>>> --- Test case for gh-3637, gh-4550. Before the fix replica would
>>>>> --- exit with an error if a user does not exist or a password is
>>>>> --- incorrect. Now check that we don't hang/panic and successfully
>>>>> --- connect.
>>>>> ---
>>>>> -fiber = require('fiber')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("create server replica_auth with rpl_master=default, 
>>>>> script='replication/replica_auth.lua'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("start server replica_auth with wait=False, 
>>>>> wait_load=False, args='cluster:pass 0.05'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- Wait a bit to make sure replica waits till user is created.
>>>>> -fiber.sleep(0.1)
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.create('cluster')
>>>>> ----
>>>>> -...
>>>>> --- The user is created. Let the replica fail auth request due to
>>>>> --- a wrong password.
>>>>> -fiber.sleep(0.1)
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.passwd('cluster', 'pass')
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.grant('cluster', 'replication')
>>>>> ----
>>>>> -...
>>>>> -while box.info.replication[2] == nil do fiber.sleep(0.01) end
>>>>> ----
>>>>> -...
>>>>> -vclock = test_run:get_vclock('default')
>>>>> ----
>>>>> -...
>>>>> -vclock[0] = nil
>>>>> ----
>>>>> -...
>>>>> -_ = test_run:wait_vclock('replica_auth', vclock)
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("stop server replica_auth")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("cleanup server replica_auth")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("delete server replica_auth")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.drop('cluster')
>>>>> ----
>>>>> -...
>>>>> ---
>>>>> --- Test case for gh-3610. Before the fix replica would fail with 
>>>>> the assertion
>>>>> --- when trying to connect to the same master twice.
>>>>> ---
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("start server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("switch replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -replication = box.cfg.replication[1]
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication = {replication, replication}}
>>>>> ----
>>>>> -- error: 'Incorrect value for option ''replication'': duplicate 
>>>>> connection to the
>>>>> -    same replica'
>>>>> -...
>>>>> --- Check the case when duplicate connection is detected in the 
>>>>> background.
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -listen = box.cfg.listen
>>>>> ----
>>>>> -...
>>>>> -box.cfg{listen = ''}
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{replication_connect_quorum = 0, 
>>>>> replication_connect_timeout = 0.01}
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication = {replication, replication}}
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{listen = listen}
>>>>> ----
>>>>> -...
>>>>> -while test_run:grep_log('replica', 'duplicate connection') == nil 
>>>>> do fiber.sleep(0.01) end
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("stop server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("cleanup server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("delete server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> ---
>>>>> --- gh-3711 Do not restart replication on box.cfg in case the
>>>>> --- configuration didn't change.
>>>>> ---
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("start server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- Access rights are checked only during reconnect. If the new
>>>>> --- and old configurations are equivalent, no reconnect will be
>>>>> --- issued and replication should continue working.
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -replication = box.cfg.replication[1]
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication = {replication}}
>>>>> ----
>>>>> -...
>>>>> -box.info.status == 'running'
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{replication = replication}
>>>>> ----
>>>>> -...
>>>>> -box.info.status == 'running'
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- Check that comparison of tables works as expected as well.
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -replication = box.cfg.replication
>>>>> ----
>>>>> -...
>>>>> -table.insert(replication, box.cfg.listen)
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{replication = replication}
>>>>> ----
>>>>> -...
>>>>> -box.info.status == 'running'
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("stop server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("cleanup server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("delete server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> ---
>>>>> --- gh-3704 move cluster id check to replica
>>>>> ---
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.schema.user.grant("guest", "replication")
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("start server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:grep_log("replica", "REPLICASET_UUID_MISMATCH")
>>>>> ----
>>>>> -- null
>>>>> -...
>>>>> -box.info.replication[2].downstream.status
>>>>> ----
>>>>> -- follow
>>>>> -...
>>>>> --- change master's cluster uuid and check that replica doesn't 
>>>>> connect.
>>>>> -test_run:cmd("stop server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -_ = box.space._schema:replace{'cluster', tostring(uuid.new())}
>>>>> ----
>>>>> -...
>>>>> --- master believes replica is in cluster, but their cluster UUIDs 
>>>>> differ.
>>>>> -test_run:cmd("start server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:wait_log("replica", "REPLICASET_UUID_MISMATCH", nil, 1.0)
>>>>> ----
>>>>> -- REPLICASET_UUID_MISMATCH
>>>>> -...
>>>>> -test_run:wait_downstream(2, {status = 'stopped'})
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("stop server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("cleanup server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("delete server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> ---
>>>>> --- gh-4399 Check that an error reading WAL directory on subscribe
>>>>> --- doesn't lead to a permanent replication failure.
>>>>> ---
>>>>> -box.schema.user.grant("guest", "replication")
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("start server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- Make the WAL directory inaccessible.
>>>>> -fio = require('fio')
>>>>> ----
>>>>> -...
>>>>> -path = fio.abspath(box.cfg.wal_dir)
>>>>> ----
>>>>> -...
>>>>> -fio.chmod(path, 0)
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- Break replication on timeout.
>>>>> -replication_timeout = box.cfg.replication_timeout
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication_timeout = 9000}
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status ~= 'follow' end)
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -require('fiber').sleep(box.cfg.replication_timeout)
>>>>> ----
>>>>> -...
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -box.cfg{replication_timeout = replication_timeout}
>>>>> ----
>>>>> -...
>>>>> --- Restore access to the WAL directory.
>>>>> --- Wait for replication to be reestablished.
>>>>> -fio.chmod(path, tonumber('777', 8))
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("switch replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status == 'follow' end)
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("switch default")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("stop server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("cleanup server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cmd("delete server replica")
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> -test_run:cleanup_cluster()
>>>>> ----
>>>>> -...
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> ----
>>>>> -...
>>>>> ---
>>>>> --- gh-4424 Always enter orphan mode on error in replication
>>>>> --- configuration change.
>>>>> ---
>>>>> -replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> ----
>>>>> -...
>>>>> -replication_connect_quorum = box.cfg.replication_connect_quorum
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication="12345", replication_connect_timeout=0.1, 
>>>>> replication_connect_quorum=1}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- orphan
>>>>> -...
>>>>> -box.info.ro
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- reset replication => leave orphan mode
>>>>> -box.cfg{replication=""}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- running
>>>>> -...
>>>>> -box.info.ro
>>>>> ----
>>>>> -- false
>>>>> -...
>>>>> --- no switch to orphan when quorum == 0
>>>>> -box.cfg{replication="12345", replication_connect_quorum=0}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- running
>>>>> -...
>>>>> -box.info.ro
>>>>> ----
>>>>> -- false
>>>>> -...
>>>>> --- we could connect to one out of two replicas. Set orphan.
>>>>> -box.cfg{replication_connect_quorum=2}
>>>>> ----
>>>>> -...
>>>>> -box.cfg{replication={box.cfg.listen, "12345"}}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- orphan
>>>>> -...
>>>>> -box.info.ro
>>>>> ----
>>>>> -- true
>>>>> -...
>>>>> --- lower quorum => leave orphan mode
>>>>> -box.cfg{replication_connect_quorum=1}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- running
>>>>> -...
>>>>> -box.info.ro
>>>>> ----
>>>>> -- false
>>>>> -...
>>>>> ---
>>>>> --- gh-3760: replication quorum 0 on reconfiguration should return
>>>>> --- from box.cfg immediately.
>>>>> ---
>>>>> -replication = box.cfg.replication
>>>>> ----
>>>>> -...
>>>>> -box.cfg{                                                        \
>>>>> -    replication = {},                                           \
>>>>> -    replication_connect_quorum = 0,                             \
>>>>> -    replication_connect_timeout = 1000000                       \
>>>>> -}
>>>>> ----
>>>>> -...
>>>>> --- The call below would hang, if quorum 0 is ignored, or checked
>>>>> --- too late.
>>>>> -box.cfg{replication = {'localhost:12345'}}
>>>>> ----
>>>>> -...
>>>>> -box.info.status
>>>>> ----
>>>>> -- running
>>>>> -...
>>>>> -box.cfg{                                                        \
>>>>> -    replication = {},                                           \
>>>>> -    replication_connect_quorum = replication_connect_quorum,    \
>>>>> -    replication_connect_timeout = replication_connect_timeout   \
>>>>> -}
>>>>> ----
>>>>> -...
>>>>> diff --git a/test/replication/misc.test.lua 
>>>>> b/test/replication/misc.test.lua
>>>>> deleted file mode 100644
>>>>> index d285b014a..000000000
>>>>> --- a/test/replication/misc.test.lua
>>>>> +++ /dev/null
>>>>> @@ -1,356 +0,0 @@
>>>>> -uuid = require('uuid')
>>>>> -test_run = require('test_run').new()
>>>>> -
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> -
>>>>> --- gh-2991 - Tarantool asserts on box.cfg.replication update if 
>>>>> one of
>>>>> --- servers is dead
>>>>> -replication_timeout = box.cfg.replication_timeout
>>>>> -replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> -box.cfg{replication_timeout=0.05, 
>>>>> replication_connect_timeout=0.05, replication={}}
>>>>> -box.cfg{replication_connect_quorum=2}
>>>>> -box.cfg{replication = {'127.0.0.1:12345', box.cfg.listen}}
>>>>> -box.info.status
>>>>> -box.info.ro
>>>>> -
>>>>> --- gh-3606 - Tarantool crashes if box.cfg.replication is updated 
>>>>> concurrently
>>>>> -fiber = require('fiber')
>>>>> -c = fiber.channel(2)
>>>>> -f = function() fiber.create(function() pcall(box.cfg, 
>>>>> {replication = {12345}}) c:put(true) end) end
>>>>> -f()
>>>>> -f()
>>>>> -c:get()
>>>>> -c:get()
>>>>> -
>>>>> -box.cfg{replication = "", replication_timeout = 
>>>>> replication_timeout, replication_connect_timeout = 
>>>>> replication_connect_timeout}
>>>>> -box.info.status
>>>>> -box.info.ro
>>>>> -
>>>>> --- gh-3111 - Allow to rebootstrap a replica from a read-only master
>>>>> -replica_uuid = uuid.new()
>>>>> -test_run:cmd('create server test with rpl_master=default, 
>>>>> script="replication/replica_uuid.lua"')
>>>>> -test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> -test_run:cmd('stop server test')
>>>>> -test_run:cmd('cleanup server test')
>>>>> -box.cfg{read_only = true}
>>>>> -test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> -test_run:cmd('stop server test')
>>>>> -test_run:cmd('cleanup server test')
>>>>> -box.cfg{read_only = false}
>>>>> -test_run:cmd('delete server test')
>>>>> -test_run:cleanup_cluster()
>>>>> -
>>>>> --- gh-3160 - Send heartbeats if there are changes from a remote 
>>>>> master only
>>>>> -SERVERS = { 'autobootstrap1', 'autobootstrap2', 'autobootstrap3' }
>>>>> -
>>>>> --- Deploy a cluster.
>>>>> -test_run:create_cluster(SERVERS, "replication", {args="0.03"})
>>>>> -test_run:wait_fullmesh(SERVERS)
>>>>> -test_run:cmd("switch autobootstrap3")
>>>>> -test_run = require('test_run').new()
>>>>> -fiber = require('fiber')
>>>>> -_ = box.schema.space.create('test_timeout'):create_index('pk')
>>>>> -test_run:cmd("setopt delimiter ';'")
>>>>> -function wait_not_follow(replicaA, replicaB)
>>>>> -    return test_run:wait_cond(function()
>>>>> -        return replicaA.status ~= 'follow' or replicaB.status ~= 
>>>>> 'follow'
>>>>> -    end, box.cfg.replication_timeout)
>>>>> -end;
>>>>> -function test_timeout()
>>>>> -    local replicaA = box.info.replication[1].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> -    local replicaB = box.info.replication[3].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> -    local follows = test_run:wait_cond(function()
>>>>> -        return replicaA.status == 'follow' or replicaB.status == 
>>>>> 'follow'
>>>>> -    end)
>>>>> -    if not follows then error('replicas are not in the follow 
>>>>> status') end
>>>>> -    for i = 0, 99 do
>>>>> -        box.space.test_timeout:replace({1})
>>>>> -        if wait_not_follow(replicaA, replicaB) then
>>>>> -            return error(box.info.replication)
>>>>> -        end
>>>>> -    end
>>>>> -    return true
>>>>> -end;
>>>>> -test_run:cmd("setopt delimiter ''");
>>>>> -test_timeout()
>>>>> -
>>>>> --- gh-3247 - Sequence-generated value is not replicated in case
>>>>> --- the request was sent via iproto.
>>>>> -test_run:cmd("switch autobootstrap1")
>>>>> -net_box = require('net.box')
>>>>> -_ = box.schema.space.create('space1')
>>>>> -_ = box.schema.sequence.create('seq')
>>>>> -_ = box.space.space1:create_index('primary', {sequence = true} )
>>>>> -_ = box.space.space1:create_index('secondary', {parts = {2, 
>>>>> 'unsigned'}})
>>>>> -box.schema.user.grant('guest', 'read,write', 'space', 'space1')
>>>>> -c = net_box.connect(box.cfg.listen)
>>>>> -c.space.space1:insert{box.NULL, "data"} -- fails, but bumps 
>>>>> sequence value
>>>>> -c.space.space1:insert{box.NULL, 1, "data"}
>>>>> -box.space.space1:select{}
>>>>> -vclock = test_run:get_vclock("autobootstrap1")
>>>>> -vclock[0] = nil
>>>>> -_ = test_run:wait_vclock("autobootstrap2", vclock)
>>>>> -test_run:cmd("switch autobootstrap2")
>>>>> -box.space.space1:select{}
>>>>> -test_run:cmd("switch autobootstrap1")
>>>>> -box.space.space1:drop()
>>>>> -
>>>>> -test_run:cmd("switch default")
>>>>> -test_run:drop_cluster(SERVERS)
>>>>> -test_run:cleanup_cluster()
>>>>> -
>>>>> --- gh-3642 - Check that socket file descriptor doesn't leak
>>>>> --- when a replica is disconnected.
>>>>> -rlimit = require('rlimit')
>>>>> -lim = rlimit.limit()
>>>>> -rlimit.getrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> -old_fno = lim.rlim_cur
>>>>> -lim.rlim_cur = 64
>>>>> -rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> -
>>>>> -test_run:cmd('create server sock with rpl_master=default, 
>>>>> script="replication/replica.lua"')
>>>>> -test_run:cmd('start server sock')
>>>>> -test_run:cmd('switch sock')
>>>>> -test_run = require('test_run').new()
>>>>> -fiber = require('fiber')
>>>>> -test_run:cmd("setopt delimiter ';'")
>>>>> -for i = 1, 64 do
>>>>> -    local replication = box.cfg.replication
>>>>> -    box.cfg{replication = {}}
>>>>> -    box.cfg{replication = replication}
>>>>> -    while box.info.replication[1].upstream.status ~= 'follow' do
>>>>> -        fiber.sleep(0.001)
>>>>> -    end
>>>>> -end;
>>>>> -test_run:cmd("setopt delimiter ''");
>>>>> -
>>>>> -box.info.replication[1].upstream.status
>>>>> -
>>>>> -test_run:cmd('switch default')
>>>>> -
>>>>> -lim.rlim_cur = old_fno
>>>>> -rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> -
>>>>> -test_run:cmd("stop server sock")
>>>>> -test_run:cmd("cleanup server sock")
>>>>> -test_run:cmd("delete server sock")
>>>>> -test_run:cleanup_cluster()
>>>>> -
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> -
>>>>> --- gh-3510 assertion failure in replica_on_applier_disconnect()
>>>>> -test_run:cmd('create server er_load1 with 
>>>>> script="replication/er_load1.lua"')
>>>>> -test_run:cmd('create server er_load2 with 
>>>>> script="replication/er_load2.lua"')
>>>>> -test_run:cmd('start server er_load1 with wait=False, 
>>>>> wait_load=False')
>>>>> --- Instance er_load2 will fail with error 
>>>>> ER_REPLICASET_UUID_MISMATCH.
>>>>> --- This is OK since we only test here that er_load1 doesn't assert.
>>>>> -test_run:cmd('start server er_load2 with wait=True, 
>>>>> wait_load=True, crash_expected = True')
>>>>> -test_run:cmd('stop server er_load1')
>>>>> --- er_load2 exits automatically.
>>>>> -test_run:cmd('cleanup server er_load1')
>>>>> -test_run:cmd('cleanup server er_load2')
>>>>> -test_run:cmd('delete server er_load1')
>>>>> -test_run:cmd('delete server er_load2')
>>>>> -test_run:cleanup_cluster()
>>>>> -
>>>>> ---
>>>>> --- Test case for gh-3637, gh-4550. Before the fix replica would
>>>>> --- exit with an error if a user does not exist or a password is
>>>>> --- incorrect. Now check that we don't hang/panic and successfully
>>>>> --- connect.
>>>>> ---
>>>>> -fiber = require('fiber')
>>>>> -test_run:cmd("create server replica_auth with rpl_master=default, 
>>>>> script='replication/replica_auth.lua'")
>>>>> -test_run:cmd("start server replica_auth with wait=False, 
>>>>> wait_load=False, args='cluster:pass 0.05'")
>>>>> --- Wait a bit to make sure replica waits till user is created.
>>>>> -fiber.sleep(0.1)
>>>>> -box.schema.user.create('cluster')
>>>>> --- The user is created. Let the replica fail auth request due to
>>>>> --- a wrong password.
>>>>> -fiber.sleep(0.1)
>>>>> -box.schema.user.passwd('cluster', 'pass')
>>>>> -box.schema.user.grant('cluster', 'replication')
>>>>> -
>>>>> -while box.info.replication[2] == nil do fiber.sleep(0.01) end
>>>>> -vclock = test_run:get_vclock('default')
>>>>> -vclock[0] = nil
>>>>> -_ = test_run:wait_vclock('replica_auth', vclock)
>>>>> -
>>>>> -test_run:cmd("stop server replica_auth")
>>>>> -test_run:cmd("cleanup server replica_auth")
>>>>> -test_run:cmd("delete server replica_auth")
>>>>> -test_run:cleanup_cluster()
>>>>> -
>>>>> -box.schema.user.drop('cluster')
>>>>> -
>>>>> ---
>>>>> --- Test case for gh-3610. Before the fix replica would fail with 
>>>>> the assertion
>>>>> --- when trying to connect to the same master twice.
>>>>> ---
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> -test_run:cmd("start server replica")
>>>>> -test_run:cmd("switch replica")
>>>>> -replication = box.cfg.replication[1]
>>>>> -box.cfg{replication = {replication, replication}}
>>>>> -
>>>>> --- Check the case when duplicate connection is detected in the 
>>>>> background.
>>>>> -test_run:cmd("switch default")
>>>>> -listen = box.cfg.listen
>>>>> -box.cfg{listen = ''}
>>>>> -
>>>>> -test_run:cmd("switch replica")
>>>>> -box.cfg{replication_connect_quorum = 0, 
>>>>> replication_connect_timeout = 0.01}
>>>>> -box.cfg{replication = {replication, replication}}
>>>>> -
>>>>> -test_run:cmd("switch default")
>>>>> -box.cfg{listen = listen}
>>>>> -while test_run:grep_log('replica', 'duplicate connection') == nil 
>>>>> do fiber.sleep(0.01) end
>>>>> -
>>>>> -test_run:cmd("stop server replica")
>>>>> -test_run:cmd("cleanup server replica")
>>>>> -test_run:cmd("delete server replica")
>>>>> -test_run:cleanup_cluster()
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> -
>>>>> ---
>>>>> --- gh-3711 Do not restart replication on box.cfg in case the
>>>>> --- configuration didn't change.
>>>>> ---
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> -test_run:cmd("start server replica")
>>>>> -
>>>>> --- Access rights are checked only during reconnect. If the new
>>>>> --- and old configurations are equivalent, no reconnect will be
>>>>> --- issued and replication should continue working.
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> -test_run:cmd("switch replica")
>>>>> -replication = box.cfg.replication[1]
>>>>> -box.cfg{replication = {replication}}
>>>>> -box.info.status == 'running'
>>>>> -box.cfg{replication = replication}
>>>>> -box.info.status == 'running'
>>>>> -
>>>>> --- Check that comparison of tables works as expected as well.
>>>>> -test_run:cmd("switch default")
>>>>> -box.schema.user.grant('guest', 'replication')
>>>>> -test_run:cmd("switch replica")
>>>>> -replication = box.cfg.replication
>>>>> -table.insert(replication, box.cfg.listen)
>>>>> -test_run:cmd("switch default")
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> -test_run:cmd("switch replica")
>>>>> -box.cfg{replication = replication}
>>>>> -box.info.status == 'running'
>>>>> -
>>>>> -test_run:cmd("switch default")
>>>>> -test_run:cmd("stop server replica")
>>>>> -test_run:cmd("cleanup server replica")
>>>>> -test_run:cmd("delete server replica")
>>>>> -test_run:cleanup_cluster()
>>>>> -
>>>>> ---
>>>>> --- gh-3704 move cluster id check to replica
>>>>> ---
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> -box.schema.user.grant("guest", "replication")
>>>>> -test_run:cmd("start server replica")
>>>>> -test_run:grep_log("replica", "REPLICASET_UUID_MISMATCH")
>>>>> -box.info.replication[2].downstream.status
>>>>> --- change master's cluster uuid and check that replica doesn't 
>>>>> connect.
>>>>> -test_run:cmd("stop server replica")
>>>>> -_ = box.space._schema:replace{'cluster', tostring(uuid.new())}
>>>>> --- master believes replica is in cluster, but their cluster UUIDs 
>>>>> differ.
>>>>> -test_run:cmd("start server replica")
>>>>> -test_run:wait_log("replica", "REPLICASET_UUID_MISMATCH", nil, 1.0)
>>>>> -test_run:wait_downstream(2, {status = 'stopped'})
>>>>> -
>>>>> -test_run:cmd("stop server replica")
>>>>> -test_run:cmd("cleanup server replica")
>>>>> -test_run:cmd("delete server replica")
>>>>> -test_run:cleanup_cluster()
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> -
>>>>> ---
>>>>> --- gh-4399 Check that an error reading WAL directory on subscribe
>>>>> --- doesn't lead to a permanent replication failure.
>>>>> ---
>>>>> -box.schema.user.grant("guest", "replication")
>>>>> -test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> -test_run:cmd("start server replica")
>>>>> -
>>>>> --- Make the WAL directory inaccessible.
>>>>> -fio = require('fio')
>>>>> -path = fio.abspath(box.cfg.wal_dir)
>>>>> -fio.chmod(path, 0)
>>>>> -
>>>>> --- Break replication on timeout.
>>>>> -replication_timeout = box.cfg.replication_timeout
>>>>> -box.cfg{replication_timeout = 9000}
>>>>> -test_run:cmd("switch replica")
>>>>> -test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status ~= 'follow' end)
>>>>> -require('fiber').sleep(box.cfg.replication_timeout)
>>>>> -test_run:cmd("switch default")
>>>>> -box.cfg{replication_timeout = replication_timeout}
>>>>> -
>>>>> --- Restore access to the WAL directory.
>>>>> --- Wait for replication to be reestablished.
>>>>> -fio.chmod(path, tonumber('777', 8))
>>>>> -test_run:cmd("switch replica")
>>>>> -test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status == 'follow' end)
>>>>> -test_run:cmd("switch default")
>>>>> -
>>>>> -test_run:cmd("stop server replica")
>>>>> -test_run:cmd("cleanup server replica")
>>>>> -test_run:cmd("delete server replica")
>>>>> -test_run:cleanup_cluster()
>>>>> -box.schema.user.revoke('guest', 'replication')
>>>>> -
>>>>> ---
>>>>> --- gh-4424 Always enter orphan mode on error in replication
>>>>> --- configuration change.
>>>>> ---
>>>>> -replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> -replication_connect_quorum = box.cfg.replication_connect_quorum
>>>>> -box.cfg{replication="12345", replication_connect_timeout=0.1, 
>>>>> replication_connect_quorum=1}
>>>>> -box.info.status
>>>>> -box.info.ro
>>>>> --- reset replication => leave orphan mode
>>>>> -box.cfg{replication=""}
>>>>> -box.info.status
>>>>> -box.info.ro
>>>>> --- no switch to orphan when quorum == 0
>>>>> -box.cfg{replication="12345", replication_connect_quorum=0}
>>>>> -box.info.status
>>>>> -box.info.ro
>>>>> -
>>>>> --- we could connect to one out of two replicas. Set orphan.
>>>>> -box.cfg{replication_connect_quorum=2}
>>>>> -box.cfg{replication={box.cfg.listen, "12345"}}
>>>>> -box.info.status
>>>>> -box.info.ro
>>>>> --- lower quorum => leave orphan mode
>>>>> -box.cfg{replication_connect_quorum=1}
>>>>> -box.info.status
>>>>> -box.info.ro
>>>>> -
>>>>> ---
>>>>> --- gh-3760: replication quorum 0 on reconfiguration should return
>>>>> --- from box.cfg immediately.
>>>>> ---
>>>>> -replication = box.cfg.replication
>>>>> -box.cfg{                                                        \
>>>>> -    replication = {},                                           \
>>>>> -    replication_connect_quorum = 0,                             \
>>>>> -    replication_connect_timeout = 1000000                       \
>>>>> -}
>>>>> --- The call below would hang, if quorum 0 is ignored, or checked
>>>>> --- too late.
>>>>> -box.cfg{replication = {'localhost:12345'}}
>>>>> -box.info.status
>>>>> -box.cfg{                                                        \
>>>>> -    replication = {},                                           \
>>>>> -    replication_connect_quorum = replication_connect_quorum,    \
>>>>> -    replication_connect_timeout = replication_connect_timeout   \
>>>>> -}
>>>>> diff --git 
>>>>> a/test/replication/misc_assert_connecting_master_twice_gh-3610.result 
>>>>> b/test/replication/misc_assert_connecting_master_twice_gh-3610.result
>>>>> new file mode 100644
>>>>> index 000000000..d7b7cc25b
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_assert_connecting_master_twice_gh-3610.result
>>>>> @@ -0,0 +1,86 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>> I don't  think you should restart the server here.
>>>> The test seems fine without it. Same about almost all the
>>>> testcases below.
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>>> +---
>>>>> +...
>>>> UUID and fiber modules aren't used in this test, so please remove
>>>> these two extra lines. Same about almost all the testcases below.
>>>>
>>>>
>>>> The branch contains this extraneous change:
>>>>
>>>> +replication_connect_quorum = box.cfg.replication_connect_quorum
>>>>
>>>> +---
>>>> +...
>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>> +---
>>>>
>>>> +...
>>>>
>>>> You don't need to save these options, since you only change them on a
>>>> replica.
>>>>
>>>>> +--
>>>>> +-- Test case for gh-3610. Before the fix replica would fail with 
>>>>> the assertion
>>>>> +-- when trying to connect to the same master twice.
>>>>> +--
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("start server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("switch replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +replication = box.cfg.replication[1]
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication = {replication, replication}}
>>>>> +---
>>>>> +- error: 'Incorrect value for option ''replication'': duplicate 
>>>>> connection to the
>>>>> +    same replica'
>>>>> +...
>>>>> +-- Check the case when duplicate connection is detected in the 
>>>>> background.
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +listen = box.cfg.listen
>>>>> +---
>>>>> +...
>>>>> +box.cfg{listen = ''}
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{replication_connect_quorum = 0, 
>>>>> replication_connect_timeout = 0.01}
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication = {replication, replication}}
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{listen = listen}
>>>>> +---
>>>>> +...
>>>>> +while test_run:grep_log('replica', 'duplicate connection') == nil 
>>>>> do fiber.sleep(0.01) end
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("stop server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("delete server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +---
>>>>> +...
>>>> +box.cfg{replication = "", \
>>>> +        replication_connect_quorum = replication_connect_quorum, \
>>>> +        replication_connect_timeout = replication_connect_timeout}
>>>> +---
>>>> +...
>>>>
>>>> The change I spoke of above. This piece is also unneeded.
>>>>
>>>>> diff --git 
>>>>> a/test/replication/misc_assert_connecting_master_twice_gh-3610.test.lua 
>>>>> b/test/replication/misc_assert_connecting_master_twice_gh-3610.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..9b12e623b
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_assert_connecting_master_twice_gh-3610.test.lua 
>>>>>
>>>>> @@ -0,0 +1,34 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +fiber = require('fiber')
>>>>> +
>>>>> +--
>>>>> +-- Test case for gh-3610. Before the fix replica would fail with 
>>>>> the assertion
>>>>> +-- when trying to connect to the same master twice.
>>>>> +--
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +test_run:cmd("start server replica")
>>>>> +test_run:cmd("switch replica")
>>>>> +replication = box.cfg.replication[1]
>>>>> +box.cfg{replication = {replication, replication}}
>>>>> +
>>>>> +-- Check the case when duplicate connection is detected in the 
>>>>> background.
>>>>> +test_run:cmd("switch default")
>>>>> +listen = box.cfg.listen
>>>>> +box.cfg{listen = ''}
>>>>> +
>>>>> +test_run:cmd("switch replica")
>>>>> +box.cfg{replication_connect_quorum = 0, 
>>>>> replication_connect_timeout = 0.01}
>>>>> +box.cfg{replication = {replication, replication}}
>>>>> +
>>>>> +test_run:cmd("switch default")
>>>>> +box.cfg{listen = listen}
>>>>> +while test_run:grep_log('replica', 'duplicate connection') == nil 
>>>>> do fiber.sleep(0.01) end
>>>>> +
>>>>> +test_run:cmd("stop server replica")
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +test_run:cmd("delete server replica")
>>>>> +test_run:cleanup_cluster()
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> diff --git 
>>>>> a/test/replication/misc_assert_on_server_die_gh-2991.result 
>>>>> b/test/replication/misc_assert_on_server_die_gh-2991.result
>>>>> new file mode 100644
>>>>> index 000000000..ea9e80f6b
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_assert_on_server_die_gh-2991.result
>>>>> @@ -0,0 +1,31 @@
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>> UUID module isn't used in this testcase, please remove the extra line.
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +-- gh-2991 - Tarantool asserts on box.cfg.replication update if 
>>>>> one of
>>>>> +-- servers is dead
>>>>> +replication_timeout = box.cfg.replication_timeout
>>>>> +---
>>>>> +...
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication_timeout=0.05, 
>>>>> replication_connect_timeout=0.05, replication={}}
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication_connect_quorum=2}
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication = {'127.0.0.1:12345', box.cfg.listen}}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- orphan
>>>>> +...
>>>>> +box.info.ro
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_assert_on_server_die_gh-2991.test.lua 
>>>>> b/test/replication/misc_assert_on_server_die_gh-2991.test.lua
>>>>> new file mode 100644
>>>>> index 000000000..adda839f7
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_assert_on_server_die_gh-2991.test.lua
>>>>> @@ -0,0 +1,12 @@
>>>>> +uuid = require('uuid')
>>>>> +test_run = require('test_run').new()
>>>>> +
>>>>> +-- gh-2991 - Tarantool asserts on box.cfg.replication update if 
>>>>> one of
>>>>> +-- servers is dead
>>>>> +replication_timeout = box.cfg.replication_timeout
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +box.cfg{replication_timeout=0.05, 
>>>>> replication_connect_timeout=0.05, replication={}}
>>>>> +box.cfg{replication_connect_quorum=2}
>>>>> +box.cfg{replication = {'127.0.0.1:12345', box.cfg.listen}}
>>>>> +box.info.status
>>>>> +box.info.ro
>>>>> diff --git 
>>>>> a/test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.result 
>>>>> b/test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.result 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..82f5d9a23
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.result
>>>>> @@ -0,0 +1,49 @@
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>> Same about the uuid.
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +-- gh-3510 assertion failure in replica_on_applier_disconnect()
>>>>> +test_run:cmd('create server er_load1 with 
>>>>> script="replication/er_load1.lua"')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('create server er_load2 with 
>>>>> script="replication/er_load2.lua"')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('start server er_load1 with wait=False, 
>>>>> wait_load=False')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- Instance er_load2 will fail with error 
>>>>> ER_REPLICASET_UUID_MISMATCH.
>>>>> +-- This is OK since we only test here that er_load1 doesn't assert.
>>>>> +test_run:cmd('start server er_load2 with wait=True, 
>>>>> wait_load=True, crash_expected = True')
>>>>> +---
>>>>> +- false
>>>>> +...
>>>>> +test_run:cmd('stop server er_load1')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- er_load2 exits automatically.
>>>>> +test_run:cmd('cleanup server er_load1')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('cleanup server er_load2')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('delete server er_load1')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('delete server er_load2')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.test.lua 
>>>>> b/test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..4e1d2a41e
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_assert_replica_on_applier_disconnect_gh-3510.test.lua
>>>>> @@ -0,0 +1,17 @@
>>>>> +uuid = require('uuid')
>>>>> +test_run = require('test_run').new()
>>>>> +
>>>>> +-- gh-3510 assertion failure in replica_on_applier_disconnect()
>>>>> +test_run:cmd('create server er_load1 with 
>>>>> script="replication/er_load1.lua"')
>>>>> +test_run:cmd('create server er_load2 with 
>>>>> script="replication/er_load2.lua"')
>>>>> +test_run:cmd('start server er_load1 with wait=False, 
>>>>> wait_load=False')
>>>>> +-- Instance er_load2 will fail with error 
>>>>> ER_REPLICASET_UUID_MISMATCH.
>>>>> +-- This is OK since we only test here that er_load1 doesn't assert.
>>>>> +test_run:cmd('start server er_load2 with wait=True, 
>>>>> wait_load=True, crash_expected = True')
>>>>> +test_run:cmd('stop server er_load1')
>>>>> +-- er_load2 exits automatically.
>>>>> +test_run:cmd('cleanup server er_load1')
>>>>> +test_run:cmd('cleanup server er_load2')
>>>>> +test_run:cmd('delete server er_load1')
>>>>> +test_run:cmd('delete server er_load2')
>>>>> +test_run:cleanup_cluster()
>>>>> diff --git 
>>>>> a/test/replication/misc_crash_on_box_concurrent_update_gh-3606.result 
>>>>> b/test/replication/misc_crash_on_box_concurrent_update_gh-3606.result
>>>>> new file mode 100644
>>>>> index 000000000..b43b00849
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_crash_on_box_concurrent_update_gh-3606.result
>>>>> @@ -0,0 +1,50 @@
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>> Same about UUID.
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +replication_timeout = box.cfg.replication_timeout
>>>>> +---
>>>>> +...
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication_timeout=0.05, 
>>>>> replication_connect_timeout=0.05, replication={}}
>>>>> +---
>>>>> +...
>>>>> +-- gh-3606 - Tarantool crashes if box.cfg.replication is updated 
>>>>> concurrently
>>>>> +fiber = require('fiber')
>>>>> +---
>>>>> +...
>>>>> +c = fiber.channel(2)
>>>>> +---
>>>>> +...
>>>>> +f = function() fiber.create(function() pcall(box.cfg, 
>>>>> {replication = {12345}}) c:put(true) end) end
>>>>> +---
>>>>> +...
>>>>> +f()
>>>>> +---
>>>>> +...
>>>>> +f()
>>>>> +---
>>>>> +...
>>>>> +c:get()
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +c:get()
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{replication = "", replication_timeout = 
>>>>> replication_timeout, replication_connect_timeout = 
>>>>> replication_connect_timeout}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- running
>>>>> +...
>>>>> +box.info.ro
>>>>> +---
>>>>> +- false
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_crash_on_box_concurrent_update_gh-3606.test.lua 
>>>>> b/test/replication/misc_crash_on_box_concurrent_update_gh-3606.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..17f9c6bc6
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_crash_on_box_concurrent_update_gh-3606.test.lua 
>>>>>
>>>>> @@ -0,0 +1,19 @@
>>>>> +uuid = require('uuid')
>>>>> +test_run = require('test_run').new()
>>>>> +
>>>>> +replication_timeout = box.cfg.replication_timeout
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +box.cfg{replication_timeout=0.05, 
>>>>> replication_connect_timeout=0.05, replication={}}
>>>>> +
>>>>> +-- gh-3606 - Tarantool crashes if box.cfg.replication is updated 
>>>>> concurrently
>>>>> +fiber = require('fiber')
>>>>> +c = fiber.channel(2)
>>>>> +f = function() fiber.create(function() pcall(box.cfg, 
>>>>> {replication = {12345}}) c:put(true) end) end
>>>>> +f()
>>>>> +f()
>>>>> +c:get()
>>>>> +c:get()
>>>>> +
>>>>> +box.cfg{replication = "", replication_timeout = 
>>>>> replication_timeout, replication_connect_timeout = 
>>>>> replication_connect_timeout}
>>>>> +box.info.status
>>>>> +box.info.ro
>>>>> diff --git 
>>>>> a/test/replication/misc_heartbeats_on_master_changes_gh-3160.result 
>>>>> b/test/replication/misc_heartbeats_on_master_changes_gh-3160.result
>>>>> new file mode 100644
>>>>> index 000000000..cdb463614
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_heartbeats_on_master_changes_gh-3160.result
>>>>> @@ -0,0 +1,76 @@
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>> Same about UUID.
>>>>
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>> The branch contains this change:
>>>>
>>>> +...
>>>> +replication_timeout = box.cfg.replication_timeout
>>>> +---
>>>> +...
>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>> +---
>>>> +...
>>>> +box.cfg{replication_timeout=0.05, replication_connect_timeout=0.05,
>>>> replication={}}
>>>> +---
>>>> +...
>>>>
>>>> Which is extraneous in this test. The original testcase uses 
>>>> default timeout
>>>> values,
>>>> and I don't think we should change them.
>>>>
>>>>> +-- gh-3160 - Send heartbeats if there are changes from a remote 
>>>>> master only
>>>>> +SERVERS = { 'autobootstrap1', 'autobootstrap2', 'autobootstrap3' }
>>>>> +---
>>>>> +...
>>>>> +-- Deploy a cluster.
>>>>> +test_run:create_cluster(SERVERS, "replication", {args="0.03"})
>>>>> +---
>>>>> +...
>>>>> +test_run:wait_fullmesh(SERVERS)
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch autobootstrap3")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>>> +---
>>>>> +...
>>>>> +_ = box.schema.space.create('test_timeout'):create_index('pk')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("setopt delimiter ';'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +function wait_not_follow(replicaA, replicaB)
>>>>> +    return test_run:wait_cond(function()
>>>>> +        return replicaA.status ~= 'follow' or replicaB.status ~= 
>>>>> 'follow'
>>>>> +    end, box.cfg.replication_timeout)
>>>>> +end;
>>>>> +---
>>>>> +...
>>>>> +function test_timeout()
>>>>> +    local replicaA = box.info.replication[1].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> +    local replicaB = box.info.replication[3].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> +    local follows = test_run:wait_cond(function()
>>>>> +        return replicaA.status == 'follow' or replicaB.status == 
>>>>> 'follow'
>>>>> +    end)
>>>>> +    if not follows then error('replicas are not in the follow 
>>>>> status') end
>>>>> +    for i = 0, 99 do
>>>>> +        box.space.test_timeout:replace({1})
>>>>> +        if wait_not_follow(replicaA, replicaB) then
>>>>> +            return error(box.info.replication)
>>>>> +        end
>>>>> +    end
>>>>> +    return true
>>>>> +end;
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("setopt delimiter ''");
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_timeout()
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:drop_cluster(SERVERS)
>>>>> +---
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>> No need to call cleanup_cluster(). The 'default' instance wasn't 
>>>> part of the
>>>> cluster
>>>> you ran in this test.
>>>>
>>>>
>>>> +...
>>>> +box.cfg{replication = "", replication_timeout = 
>>>> replication_timeout, \
>>>> +        replication_connect_timeout = replication_connect_timeout}
>>>> +---
>>>> +...
>>>>
>>>> One more extraneous change, related to the one above.
>>>>
>>>>
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_heartbeats_on_master_changes_gh-3160.test.lua 
>>>>> b/test/replication/misc_heartbeats_on_master_changes_gh-3160.test.lua
>>>>> new file mode 100644
>>>>> index 000000000..eba8a7725
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_heartbeats_on_master_changes_gh-3160.test.lua
>>>>> @@ -0,0 +1,40 @@
>>>>> +uuid = require('uuid')
>>>>> +test_run = require('test_run').new()
>>>>> +
>>>>> +-- gh-3160 - Send heartbeats if there are changes from a remote 
>>>>> master only
>>>>> +SERVERS = { 'autobootstrap1', 'autobootstrap2', 'autobootstrap3' }
>>>>> +
>>>>> +-- Deploy a cluster.
>>>>> +test_run:create_cluster(SERVERS, "replication", {args="0.03"})
>>>>> +test_run:wait_fullmesh(SERVERS)
>>>>> +test_run:cmd("switch autobootstrap3")
>>>>> +test_run = require('test_run').new()
>>>>> +fiber = require('fiber')
>>>>> +_ = box.schema.space.create('test_timeout'):create_index('pk')
>>>>> +test_run:cmd("setopt delimiter ';'")
>>>>> +function wait_not_follow(replicaA, replicaB)
>>>>> +    return test_run:wait_cond(function()
>>>>> +        return replicaA.status ~= 'follow' or replicaB.status ~= 
>>>>> 'follow'
>>>>> +    end, box.cfg.replication_timeout)
>>>>> +end;
>>>>> +function test_timeout()
>>>>> +    local replicaA = box.info.replication[1].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> +    local replicaB = box.info.replication[3].upstream or 
>>>>> box.info.replication[2].upstream
>>>>> +    local follows = test_run:wait_cond(function()
>>>>> +        return replicaA.status == 'follow' or replicaB.status == 
>>>>> 'follow'
>>>>> +    end)
>>>>> +    if not follows then error('replicas are not in the follow 
>>>>> status') end
>>>>> +    for i = 0, 99 do
>>>>> +        box.space.test_timeout:replace({1})
>>>>> +        if wait_not_follow(replicaA, replicaB) then
>>>>> +            return error(box.info.replication)
>>>>> +        end
>>>>> +    end
>>>>> +    return true
>>>>> +end;
>>>>> +test_run:cmd("setopt delimiter ''");
>>>>> +test_timeout()
>>>>> +
>>>>> +test_run:cmd("switch default")
>>>>> +test_run:drop_cluster(SERVERS)
>>>>> +test_run:cleanup_cluster()
>>>>> diff --git 
>>>>> a/test/replication/misc_no_failure_on_error_reading_wal_gh-4399.result 
>>>>> b/test/replication/misc_no_failure_on_error_reading_wal_gh-4399.result 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..64a4de26c
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_no_failure_on_error_reading_wal_gh-4399.result 
>>>>>
>>>>> @@ -0,0 +1,97 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>> Same about restarting the server, requiring uuid and fiber. Not 
>>>> needed.
>>>>> +---
>>>>> +...
>>>>> +--
>>>>> +-- gh-4399 Check that an error reading WAL directory on subscribe
>>>>> +-- doesn't lead to a permanent replication failure.
>>>>> +--
>>>>> +box.schema.user.grant("guest", "replication")
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("start server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- Make the WAL directory inaccessible.
>>>>> +fio = require('fio')
>>>>> +---
>>>>> +...
>>>>> +path = fio.abspath(box.cfg.wal_dir)
>>>>> +---
>>>>> +...
>>>>> +fio.chmod(path, 0)
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- Break replication on timeout.
>>>>> +replication_timeout = box.cfg.replication_timeout
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication_timeout = 9000}
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status ~= 'follow' end)
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +require('fiber').sleep(box.cfg.replication_timeout)
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{replication_timeout = replication_timeout}
>>>>> +---
>>>>> +...
>>>>> +-- Restore access to the WAL directory.
>>>>> +-- Wait for replication to be reestablished.
>>>>> +fio.chmod(path, tonumber('777', 8))
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("switch replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status == 'follow' end)
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("stop server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("delete server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_no_failure_on_error_reading_wal_gh-4399.test.lua 
>>>>> b/test/replication/misc_no_failure_on_error_reading_wal_gh-4399.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..15e19a211
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_no_failure_on_error_reading_wal_gh-4399.test.lua 
>>>>>
>>>>> @@ -0,0 +1,39 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +fiber = require('fiber')
>>>>> +
>>>>> +--
>>>>> +-- gh-4399 Check that an error reading WAL directory on subscribe
>>>>> +-- doesn't lead to a permanent replication failure.
>>>>> +--
>>>>> +box.schema.user.grant("guest", "replication")
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +test_run:cmd("start server replica")
>>>>> +
>>>>> +-- Make the WAL directory inaccessible.
>>>>> +fio = require('fio')
>>>>> +path = fio.abspath(box.cfg.wal_dir)
>>>>> +fio.chmod(path, 0)
>>>>> +
>>>>> +-- Break replication on timeout.
>>>>> +replication_timeout = box.cfg.replication_timeout
>>>>> +box.cfg{replication_timeout = 9000}
>>>>> +test_run:cmd("switch replica")
>>>>> +test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status ~= 'follow' end)
>>>>> +require('fiber').sleep(box.cfg.replication_timeout)
>>>>> +test_run:cmd("switch default")
>>>>> +box.cfg{replication_timeout = replication_timeout}
>>>>> +
>>>>> +-- Restore access to the WAL directory.
>>>>> +-- Wait for replication to be reestablished.
>>>>> +fio.chmod(path, tonumber('777', 8))
>>>>> +test_run:cmd("switch replica")
>>>>> +test_run:wait_cond(function() return 
>>>>> box.info.replication[1].upstream.status == 'follow' end)
>>>>> +test_run:cmd("switch default")
>>>>> +
>>>>> +test_run:cmd("stop server replica")
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +test_run:cmd("delete server replica")
>>>>> +test_run:cleanup_cluster()
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> diff --git 
>>>>> a/test/replication/misc_no_panic_on_connected_gh-3637.result 
>>>>> b/test/replication/misc_no_panic_on_connected_gh-3637.result
>>>>> new file mode 100644
>>>>> index 000000000..693b18c42
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_no_panic_on_connected_gh-3637.result
>>>>> @@ -0,0 +1,72 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>> Again, no need for uuid here. And no need for restart.
>>>>> +--
>>>>> +-- Test case for gh-3637, gh-4550. Before the fix replica would
>>>>> +-- exit with an error if a user does not exist or a password is
>>>>> +-- incorrect. Now check that we don't hang/panic and successfully
>>>>> +-- connect.
>>>>> +--
>>>>> +fiber = require('fiber')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("create server replica_auth with rpl_master=default, 
>>>>> script='replication/replica_auth.lua'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("start server replica_auth with wait=False, 
>>>>> wait_load=False, args='cluster:pass 0.05'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- Wait a bit to make sure replica waits till user is created.
>>>>> +fiber.sleep(0.1)
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.create('cluster')
>>>>> +---
>>>>> +...
>>>>> +-- The user is created. Let the replica fail auth request due to
>>>>> +-- a wrong password.
>>>>> +fiber.sleep(0.1)
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.passwd('cluster', 'pass')
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.grant('cluster', 'replication')
>>>>> +---
>>>>> +...
>>>>> +while box.info.replication[2] == nil do fiber.sleep(0.01) end
>>>>> +---
>>>>> +...
>>>>> +vclock = test_run:get_vclock('default')
>>>>> +---
>>>>> +...
>>>>> +vclock[0] = nil
>>>>> +---
>>>>> +...
>>>>> +_ = test_run:wait_vclock('replica_auth', vclock)
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("stop server replica_auth")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("cleanup server replica_auth")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("delete server replica_auth")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.drop('cluster')
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_no_panic_on_connected_gh-3637.test.lua 
>>>>> b/test/replication/misc_no_panic_on_connected_gh-3637.test.lua
>>>>> new file mode 100644
>>>>> index 000000000..a1e51198b
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_no_panic_on_connected_gh-3637.test.lua
>>>>> @@ -0,0 +1,33 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +
>>>>> +--
>>>>> +-- Test case for gh-3637, gh-4550. Before the fix replica would
>>>>> +-- exit with an error if a user does not exist or a password is
>>>>> +-- incorrect. Now check that we don't hang/panic and successfully
>>>>> +-- connect.
>>>>> +--
>>>>> +fiber = require('fiber')
>>>>> +test_run:cmd("create server replica_auth with rpl_master=default, 
>>>>> script='replication/replica_auth.lua'")
>>>>> +test_run:cmd("start server replica_auth with wait=False, 
>>>>> wait_load=False, args='cluster:pass 0.05'")
>>>>> +-- Wait a bit to make sure replica waits till user is created.
>>>>> +fiber.sleep(0.1)
>>>>> +box.schema.user.create('cluster')
>>>>> +-- The user is created. Let the replica fail auth request due to
>>>>> +-- a wrong password.
>>>>> +fiber.sleep(0.1)
>>>>> +box.schema.user.passwd('cluster', 'pass')
>>>>> +box.schema.user.grant('cluster', 'replication')
>>>>> +
>>>>> +while box.info.replication[2] == nil do fiber.sleep(0.01) end
>>>>> +vclock = test_run:get_vclock('default')
>>>>> +vclock[0] = nil
>>>>> +_ = test_run:wait_vclock('replica_auth', vclock)
>>>>> +
>>>>> +test_run:cmd("stop server replica_auth")
>>>>> +test_run:cmd("cleanup server replica_auth")
>>>>> +test_run:cmd("delete server replica_auth")
>>>>> +test_run:cleanup_cluster()
>>>>> +
>>>>> +box.schema.user.drop('cluster')
>>>>> diff --git 
>>>>> a/test/replication/misc_no_restart_on_same_configuration_gh-3711.result 
>>>>> b/test/replication/misc_no_restart_on_same_configuration_gh-3711.result 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..dd9ef848c
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_no_restart_on_same_configuration_gh-3711.result 
>>>>>
>>>>> @@ -0,0 +1,107 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>> Same about restart, uuid and fiber.
>>>>> +---
>>>>> +...
>>>>> +--
>>>>> +-- gh-3711 Do not restart replication on box.cfg in case the
>>>>> +-- configuration didn't change.
>>>>> +--
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("start server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- Access rights are checked only during reconnect. If the new
>>>>> +-- and old configurations are equivalent, no reconnect will be
>>>>> +-- issued and replication should continue working.
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +replication = box.cfg.replication[1]
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication = {replication}}
>>>>> +---
>>>>> +...
>>>>> +box.info.status == 'running'
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{replication = replication}
>>>>> +---
>>>>> +...
>>>>> +box.info.status == 'running'
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- Check that comparison of tables works as expected as well.
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +replication = box.cfg.replication
>>>>> +---
>>>>> +...
>>>>> +table.insert(replication, box.cfg.listen)
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{replication = replication}
>>>>> +---
>>>>> +...
>>>>> +box.info.status == 'running'
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("stop server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("delete server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_no_restart_on_same_configuration_gh-3711.test.lua 
>>>>> b/test/replication/misc_no_restart_on_same_configuration_gh-3711.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..14b522ead
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_no_restart_on_same_configuration_gh-3711.test.lua
>>>>> @@ -0,0 +1,41 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +fiber = require('fiber')
>>>>> +
>>>>> +--
>>>>> +-- gh-3711 Do not restart replication on box.cfg in case the
>>>>> +-- configuration didn't change.
>>>>> +--
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +test_run:cmd("start server replica")
>>>>> +
>>>>> +-- Access rights are checked only during reconnect. If the new
>>>>> +-- and old configurations are equivalent, no reconnect will be
>>>>> +-- issued and replication should continue working.
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +test_run:cmd("switch replica")
>>>>> +replication = box.cfg.replication[1]
>>>>> +box.cfg{replication = {replication}}
>>>>> +box.info.status == 'running'
>>>>> +box.cfg{replication = replication}
>>>>> +box.info.status == 'running'
>>>>> +
>>>>> +-- Check that comparison of tables works as expected as well.
>>>>> +test_run:cmd("switch default")
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +test_run:cmd("switch replica")
>>>>> +replication = box.cfg.replication
>>>>> +table.insert(replication, box.cfg.listen)
>>>>> +test_run:cmd("switch default")
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +test_run:cmd("switch replica")
>>>>> +box.cfg{replication = replication}
>>>>> +box.info.status == 'running'
>>>>> +
>>>>> +test_run:cmd("switch default")
>>>>> +test_run:cmd("stop server replica")
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +test_run:cmd("delete server replica")
>>>>> +test_run:cleanup_cluster()
>>>>> diff --git 
>>>>> a/test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.result 
>>>>> b/test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.result 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..3680bcebb
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.result
>>>>> @@ -0,0 +1,98 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>> Unneeded restart. Correct me if I'm wrong.
>>>>
>>>>> +uuid = require('uuid')
>>>> You don't need the uuid module in this testcase.
>>>>
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> +-- gh-3642 - Check that socket file descriptor doesn't leak
>>>>> +-- when a replica is disconnected.
>>>>> +rlimit = require('rlimit')
>>>>> +---
>>>>> +...
>>>>> +lim = rlimit.limit()
>>>>> +---
>>>>> +...
>>>>> +rlimit.getrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> +---
>>>>> +...
>>>>> +old_fno = lim.rlim_cur
>>>>> +---
>>>>> +...
>>>>> +lim.rlim_cur = 64
>>>>> +---
>>>>> +...
>>>>> +rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd('create server sock with rpl_master=default, 
>>>>> script="replication/replica.lua"')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('start server sock')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('switch sock')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("setopt delimiter ';'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +for i = 1, 64 do
>>>>> +    local replication = box.cfg.replication
>>>>> +    box.cfg{replication = {}}
>>>>> +    box.cfg{replication = replication}
>>>>> +    while box.info.replication[1].upstream.status ~= 'follow' do
>>>>> +        fiber.sleep(0.001)
>>>>> +    end
>>>>> +end;
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("setopt delimiter ''");
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.info.replication[1].upstream.status
>>>>> +---
>>>>> +- follow
>>>>> +...
>>>>> +test_run:cmd('switch default')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +lim.rlim_cur = old_fno
>>>>> +---
>>>>> +...
>>>>> +rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("stop server sock")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("cleanup server sock")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("delete server sock")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.test.lua 
>>>>> b/test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..08ef9ec0d
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_no_socket_leak_on_replica_disconnect_gh-3642.test.lua
>>>>> @@ -0,0 +1,44 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +
>>>>> +-- gh-3642 - Check that socket file descriptor doesn't leak
>>>>> +-- when a replica is disconnected.
>>>>> +rlimit = require('rlimit')
>>>>> +lim = rlimit.limit()
>>>>> +rlimit.getrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> +old_fno = lim.rlim_cur
>>>>> +lim.rlim_cur = 64
>>>>> +rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> +
>>>>> +test_run:cmd('create server sock with rpl_master=default, 
>>>>> script="replication/replica.lua"')
>>>>> +test_run:cmd('start server sock')
>>>>> +test_run:cmd('switch sock')
>>>>> +test_run = require('test_run').new()
>>>>> +fiber = require('fiber')
>>>>> +test_run:cmd("setopt delimiter ';'")
>>>>> +for i = 1, 64 do
>>>>> +    local replication = box.cfg.replication
>>>>> +    box.cfg{replication = {}}
>>>>> +    box.cfg{replication = replication}
>>>>> +    while box.info.replication[1].upstream.status ~= 'follow' do
>>>>> +        fiber.sleep(0.001)
>>>>> +    end
>>>>> +end;
>>>>> +test_run:cmd("setopt delimiter ''");
>>>>> +
>>>>> +box.info.replication[1].upstream.status
>>>>> +
>>>>> +test_run:cmd('switch default')
>>>>> +
>>>>> +lim.rlim_cur = old_fno
>>>>> +rlimit.setrlimit(rlimit.RLIMIT_NOFILE, lim)
>>>>> +
>>>>> +test_run:cmd("stop server sock")
>>>>> +test_run:cmd("cleanup server sock")
>>>>> +test_run:cmd("delete server sock")
>>>>> +test_run:cleanup_cluster()
>>>>> +
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> diff --git 
>>>>> a/test/replication/misc_orphan_on_reconfiguration_error_gh-4424.result 
>>>>> b/test/replication/misc_orphan_on_reconfiguration_error_gh-4424.result 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..6a9d1148d
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_orphan_on_reconfiguration_error_gh-4424.result 
>>>>>
>>>>> @@ -0,0 +1,88 @@
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>> UUID and fiber aren't used in this testcase
>>>>
>>>>> +---
>>>>> +...
>>>>> +--
>>>>> +-- gh-4424 Always enter orphan mode on error in replication
>>>>> +-- configuration change.
>>>>> +--
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +---
>>>>> +...
>>>>> +replication_connect_quorum = box.cfg.replication_connect_quorum
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication="12345", replication_connect_timeout=0.1, 
>>>>> replication_connect_quorum=1}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- orphan
>>>>> +...
>>>>> +box.info.ro
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- reset replication => leave orphan mode
>>>>> +box.cfg{replication=""}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- running
>>>>> +...
>>>>> +box.info.ro
>>>>> +---
>>>>> +- false
>>>>> +...
>>>>> +-- no switch to orphan when quorum == 0
>>>>> +box.cfg{replication="12345", replication_connect_quorum=0}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- running
>>>>> +...
>>>>> +box.info.ro
>>>>> +---
>>>>> +- false
>>>>> +...
>>>>> +-- we could connect to one out of two replicas. Set orphan.
>>>>> +box.cfg{replication_connect_quorum=2}
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication={box.cfg.listen, "12345"}}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- orphan
>>>>> +...
>>>>> +box.info.ro
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +-- lower quorum => leave orphan mode
>>>>> +box.cfg{replication_connect_quorum=1}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- running
>>>>> +...
>>>>> +box.info.ro
>>>>> +---
>>>>> +- false
>>>>> +...
>>>>> +box.cfg{                                                        \
>>>>> +    replication = {},                                           \
>>>>> +    replication_connect_quorum = replication_connect_quorum,    \
>>>>> +    replication_connect_timeout = replication_connect_timeout   \
>>>>> +}
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_orphan_on_reconfiguration_error_gh-4424.test.lua 
>>>>> b/test/replication/misc_orphan_on_reconfiguration_error_gh-4424.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..7d1a70a36
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_orphan_on_reconfiguration_error_gh-4424.test.lua 
>>>>>
>>>>> @@ -0,0 +1,37 @@
>>>>> +uuid = require('uuid')
>>>>> +test_run = require('test_run').new()
>>>>> +fiber = require('fiber')
>>>>> +
>>>>> +--
>>>>> +-- gh-4424 Always enter orphan mode on error in replication
>>>>> +-- configuration change.
>>>>> +--
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +replication_connect_quorum = box.cfg.replication_connect_quorum
>>>>> +box.cfg{replication="12345", replication_connect_timeout=0.1, 
>>>>> replication_connect_quorum=1}
>>>>> +box.info.status
>>>>> +box.info.ro
>>>>> +-- reset replication => leave orphan mode
>>>>> +box.cfg{replication=""}
>>>>> +box.info.status
>>>>> +box.info.ro
>>>>> +-- no switch to orphan when quorum == 0
>>>>> +box.cfg{replication="12345", replication_connect_quorum=0}
>>>>> +box.info.status
>>>>> +box.info.ro
>>>>> +
>>>>> +-- we could connect to one out of two replicas. Set orphan.
>>>>> +box.cfg{replication_connect_quorum=2}
>>>>> +box.cfg{replication={box.cfg.listen, "12345"}}
>>>>> +box.info.status
>>>>> +box.info.ro
>>>>> +-- lower quorum => leave orphan mode
>>>>> +box.cfg{replication_connect_quorum=1}
>>>>> +box.info.status
>>>>> +box.info.ro
>>>>> +
>>>>> +box.cfg{                                                        \
>>>>> +    replication = {},                                           \
>>>>> +    replication_connect_quorum = replication_connect_quorum,    \
>>>>> +    replication_connect_timeout = replication_connect_timeout   \
>>>>> +}
>>>>> diff --git 
>>>>> a/test/replication/misc_rebootstrap_from_ro_master_gh-3111.result 
>>>>> b/test/replication/misc_rebootstrap_from_ro_master_gh-3111.result
>>>>> new file mode 100644
>>>>> index 000000000..7ffca1585
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_rebootstrap_from_ro_master_gh-3111.result
>>>>> @@ -0,0 +1,58 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>> Why do you need it? Seems like the test passes just fine without the
>>>> restart.
>>>> Restarting the server will take some time if this is executed after 
>>>> some
>>>> test that
>>>> performs lots of DML operations.So You better remove the change
>>>>
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> +-- gh-3111 - Allow to rebootstrap a replica from a read-only master
>>>>> +replica_uuid = uuid.new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd('create server test with rpl_master=default, 
>>>>> script="replication/replica_uuid.lua"')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('stop server test')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('cleanup server test')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{read_only = true}
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('stop server test')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd('cleanup server test')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.cfg{read_only = false}
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd('delete server test')
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_rebootstrap_from_ro_master_gh-3111.test.lua 
>>>>> b/test/replication/misc_rebootstrap_from_ro_master_gh-3111.test.lua
>>>>> new file mode 100644
>>>>> index 000000000..bb9b4a80f
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_rebootstrap_from_ro_master_gh-3111.test.lua
>>>>> @@ -0,0 +1,20 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +
>>>>> +box.schema.user.grant('guest', 'replication')
>>>>> +
>>>>> +-- gh-3111 - Allow to rebootstrap a replica from a read-only master
>>>>> +replica_uuid = uuid.new()
>>>>> +test_run:cmd('create server test with rpl_master=default, 
>>>>> script="replication/replica_uuid.lua"')
>>>>> +test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> +test_run:cmd('stop server test')
>>>>> +test_run:cmd('cleanup server test')
>>>>> +box.cfg{read_only = true}
>>>>> +test_run:cmd(string.format('start server test with args="%s"', 
>>>>> replica_uuid))
>>>>> +test_run:cmd('stop server test')
>>>>> +test_run:cmd('cleanup server test')
>>>>> +box.cfg{read_only = false}
>>>>> +test_run:cmd('delete server test')
>>>>> +test_run:cleanup_cluster()
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> diff --git 
>>>>> a/test/replication/misc_replica_checks_cluster_id_gh-3704.result 
>>>>> b/test/replication/misc_replica_checks_cluster_id_gh-3704.result
>>>>> new file mode 100644
>>>>> index 000000000..e6bc8b4d8
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_replica_checks_cluster_id_gh-3704.result
>>>>> @@ -0,0 +1,71 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>> No need to restart the instance, and require fiber module.
>>>>
>>>> UUID is needed this time.
>>>>
>>>>> +---
>>>>> +...
>>>>> +--
>>>>> +-- gh-3704 move cluster id check to replica
>>>>> +--
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.schema.user.grant("guest", "replication")
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("start server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:grep_log("replica", "REPLICASET_UUID_MISMATCH")
>>>>> +---
>>>>> +- null
>>>>> +...
>>>>> +box.info.replication[2].downstream.status
>>>>> +---
>>>>> +- follow
>>>>> +...
>>>>> +-- change master's cluster uuid and check that replica doesn't 
>>>>> connect.
>>>>> +test_run:cmd("stop server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +_ = box.space._schema:replace{'cluster', tostring(uuid.new())}
>>>>> +---
>>>>> +...
>>>>> +-- master believes replica is in cluster, but their cluster UUIDs 
>>>>> differ.
>>>>> +test_run:cmd("start server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:wait_log("replica", "REPLICASET_UUID_MISMATCH", nil, 1.0)
>>>>> +---
>>>>> +- REPLICASET_UUID_MISMATCH
>>>>> +...
>>>>> +test_run:wait_downstream(2, {status = 'stopped'})
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("stop server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cmd("delete server replica")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_replica_checks_cluster_id_gh-3704.test.lua 
>>>>> b/test/replication/misc_replica_checks_cluster_id_gh-3704.test.lua
>>>>> new file mode 100644
>>>>> index 000000000..8a23cc1fe
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_replica_checks_cluster_id_gh-3704.test.lua
>>>>> @@ -0,0 +1,26 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +fiber = require('fiber')
>>>>> +
>>>>> +--
>>>>> +-- gh-3704 move cluster id check to replica
>>>>> +--
>>>>> +test_run:cmd("create server replica with rpl_master=default, 
>>>>> script='replication/replica.lua'")
>>>>> +box.schema.user.grant("guest", "replication")
>>>>> +test_run:cmd("start server replica")
>>>>> +test_run:grep_log("replica", "REPLICASET_UUID_MISMATCH")
>>>>> +box.info.replication[2].downstream.status
>>>>> +-- change master's cluster uuid and check that replica doesn't 
>>>>> connect.
>>>>> +test_run:cmd("stop server replica")
>>>>> +_ = box.space._schema:replace{'cluster', tostring(uuid.new())}
>>>>> +-- master believes replica is in cluster, but their cluster UUIDs 
>>>>> differ.
>>>>> +test_run:cmd("start server replica")
>>>>> +test_run:wait_log("replica", "REPLICASET_UUID_MISMATCH", nil, 1.0)
>>>>> +test_run:wait_downstream(2, {status = 'stopped'})
>>>>> +
>>>>> +test_run:cmd("stop server replica")
>>>>> +test_run:cmd("cleanup server replica")
>>>>> +test_run:cmd("delete server replica")
>>>>> +test_run:cleanup_cluster()
>>>>> +box.schema.user.revoke('guest', 'replication')
>>>>> diff --git 
>>>>> a/test/replication/misc_return_on_quorum_0_gh-3760.result 
>>>>> b/test/replication/misc_return_on_quorum_0_gh-3760.result
>>>>> new file mode 100644
>>>>> index 000000000..2eb622896
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_return_on_quorum_0_gh-3760.result
>>>>> @@ -0,0 +1,48 @@
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +fiber = require('fiber')
>>>> Unneeded uuid and fiber
>>>>
>>>>> +---
>>>>> +...
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +---
>>>>> +...
>>>>> +replication_connect_quorum = box.cfg.replication_connect_quorum
>>>>> +---
>>>>> +...
>>>>> +box.cfg{replication="12345", replication_connect_timeout=0.1, 
>>>>> replication_connect_quorum=1}
>>>> This box.cfg call is extraneous. The test'll be just fine without it.
>>>>
>>>>> +---
>>>>> +...
>>>>> +--
>>>>> +-- gh-3760: replication quorum 0 on reconfiguration should return
>>>>> +-- from box.cfg immediately.
>>>>> +--
>>>>> +replication = box.cfg.replication
>>>>> +---
>>>>> +...
>>>>> +box.cfg{                                                        \
>>>>> +    replication = {},                                           \
>>>>> +    replication_connect_quorum = 0,                             \
>>>>> +    replication_connect_timeout = 1000000                       \
>>>>> +}
>>>>> +---
>>>>> +...
>>>>> +-- The call below would hang, if quorum 0 is ignored, or checked
>>>>> +-- too late.
>>>>> +box.cfg{replication = {'localhost:12345'}}
>>>>> +---
>>>>> +...
>>>>> +box.info.status
>>>>> +---
>>>>> +- running
>>>>> +...
>>>>> +box.cfg{                                                        \
>>>>> +    replication = {},                                           \
>>>>> +    replication_connect_quorum = replication_connect_quorum,    \
>>>>> +    replication_connect_timeout = replication_connect_timeout   \
>>>>> +}
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_return_on_quorum_0_gh-3760.test.lua 
>>>>> b/test/replication/misc_return_on_quorum_0_gh-3760.test.lua
>>>>> new file mode 100644
>>>>> index 000000000..9e0651032
>>>>> --- /dev/null
>>>>> +++ b/test/replication/misc_return_on_quorum_0_gh-3760.test.lua
>>>>> @@ -0,0 +1,27 @@
>>>>> +uuid = require('uuid')
>>>>> +test_run = require('test_run').new()
>>>>> +fiber = require('fiber')
>>>>> +
>>>>> +replication_connect_timeout = box.cfg.replication_connect_timeout
>>>>> +replication_connect_quorum = box.cfg.replication_connect_quorum
>>>>> +box.cfg{replication="12345", replication_connect_timeout=0.1, 
>>>>> replication_connect_quorum=1}
>>>>> +
>>>>> +--
>>>>> +-- gh-3760: replication quorum 0 on reconfiguration should return
>>>>> +-- from box.cfg immediately.
>>>>> +--
>>>>> +replication = box.cfg.replication
>>>>> +box.cfg{                                                        \
>>>>> +    replication = {},                                           \
>>>>> +    replication_connect_quorum = 0,                             \
>>>>> +    replication_connect_timeout = 1000000                       \
>>>>> +}
>>>>> +-- The call below would hang, if quorum 0 is ignored, or checked
>>>>> +-- too late.
>>>>> +box.cfg{replication = {'localhost:12345'}}
>>>>> +box.info.status
>>>>> +box.cfg{                                                        \
>>>>> +    replication = {},                                           \
>>>>> +    replication_connect_quorum = replication_connect_quorum,    \
>>>>> +    replication_connect_timeout = replication_connect_timeout   \
>>>>> +}
>>>>> diff --git 
>>>>> a/test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.result 
>>>>> b/test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.result 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..d416bd9a6
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.result
>>>>> @@ -0,0 +1,90 @@
>>>>> +test_run = require('test_run').new()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +---
>>>>> +...
>>>> You don't need  the uuid module in this testcase.
>>>>
>>>>
>>>>> +-- Deploy a cluster.
>>>>> +SERVERS = { 'autobootstrap1', 'autobootstrap2', 'autobootstrap3' }
>>>>> +---
>>>>> +...
>>>>> +test_run:create_cluster(SERVERS, "replication", {args="0.03"})
>>>>> +---
>>>>> +...
>>>>> +test_run:wait_fullmesh(SERVERS)
>>>>> +---
>>>>> +...
>>>>> +-- gh-3247 - Sequence-generated value is not replicated in case
>>>>> +-- the request was sent via iproto.
>>>>> +test_run:cmd("switch autobootstrap1")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +net_box = require('net.box')
>>>>> +---
>>>>> +...
>>>>> +_ = box.schema.space.create('space1')
>>>>> +---
>>>>> +...
>>>>> +_ = box.schema.sequence.create('seq')
>>>>> +---
>>>>> +...
>>>>> +_ = box.space.space1:create_index('primary', {sequence = true} )
>>>>> +---
>>>>> +...
>>>>> +_ = box.space.space1:create_index('secondary', {parts = {2, 
>>>>> 'unsigned'}})
>>>>> +---
>>>>> +...
>>>>> +box.schema.user.grant('guest', 'read,write', 'space', 'space1')
>>>>> +---
>>>>> +...
>>>>> +c = net_box.connect(box.cfg.listen)
>>>>> +---
>>>>> +...
>>>>> +c.space.space1:insert{box.NULL, "data"} -- fails, but bumps 
>>>>> sequence value
>>>>> +---
>>>>> +- error: 'Tuple field 2 type does not match one required by 
>>>>> operation: expected unsigned'
>>>>> +...
>>>>> +c.space.space1:insert{box.NULL, 1, "data"}
>>>>> +---
>>>>> +- [2, 1, 'data']
>>>>> +...
>>>>> +box.space.space1:select{}
>>>>> +---
>>>>> +- - [2, 1, 'data']
>>>>> +...
>>>>> +vclock = test_run:get_vclock("autobootstrap1")
>>>>> +---
>>>>> +...
>>>>> +vclock[0] = nil
>>>>> +---
>>>>> +...
>>>>> +_ = test_run:wait_vclock("autobootstrap2", vclock)
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch autobootstrap2")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.space.space1:select{}
>>>>> +---
>>>>> +- - [2, 1, 'data']
>>>>> +...
>>>>> +test_run:cmd("switch autobootstrap1")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +box.space.space1:drop()
>>>>> +---
>>>>> +...
>>>>> +test_run:cmd("switch default")
>>>>> +---
>>>>> +- true
>>>>> +...
>>>>> +test_run:drop_cluster(SERVERS)
>>>>> +---
>>>>> +...
>>>>> +test_run:cleanup_cluster()
>>>>> +---
>>>>> +...
>>>>> diff --git 
>>>>> a/test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.test.lua 
>>>>> b/test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.test.lua 
>>>>>
>>>>> new file mode 100644
>>>>> index 000000000..586e8b997
>>>>> --- /dev/null
>>>>> +++ 
>>>>> b/test/replication/misc_value_not_replicated_on_iproto_request_gh-3247.test.lua
>>>>> @@ -0,0 +1,33 @@
>>>>> +test_run = require('test_run').new()
>>>>> +test_run:cmd("restart server default")
>>>>> +uuid = require('uuid')
>>>>> +
>>>>> +-- Deploy a cluster.
>>>>> +SERVERS = { 'autobootstrap1', 'autobootstrap2', 'autobootstrap3' }
>>>>> +test_run:create_cluster(SERVERS, "replication", {args="0.03"})
>>>>> +test_run:wait_fullmesh(SERVERS)
>>>>> +
>>>>> +-- gh-3247 - Sequence-generated value is not replicated in case
>>>>> +-- the request was sent via iproto.
>>>>> +test_run:cmd("switch autobootstrap1")
>>>>> +net_box = require('net.box')
>>>>> +_ = box.schema.space.create('space1')
>>>>> +_ = box.schema.sequence.create('seq')
>>>>> +_ = box.space.space1:create_index('primary', {sequence = true} )
>>>>> +_ = box.space.space1:create_index('secondary', {parts = {2, 
>>>>> 'unsigned'}})
>>>>> +box.schema.user.grant('guest', 'read,write', 'space', 'space1')
>>>>> +c = net_box.connect(box.cfg.listen)
>>>>> +c.space.space1:insert{box.NULL, "data"} -- fails, but bumps 
>>>>> sequence value
>>>>> +c.space.space1:insert{box.NULL, 1, "data"}
>>>>> +box.space.space1:select{}
>>>>> +vclock = test_run:get_vclock("autobootstrap1")
>>>>> +vclock[0] = nil
>>>>> +_ = test_run:wait_vclock("autobootstrap2", vclock)
>>>>> +test_run:cmd("switch autobootstrap2")
>>>>> +box.space.space1:select{}
>>>>> +test_run:cmd("switch autobootstrap1")
>>>>> +box.space.space1:drop()
>>>>> +
>>>>> +test_run:cmd("switch default")
>>>>> +test_run:drop_cluster(SERVERS)
>>>>> +test_run:cleanup_cluster()
>>>>> diff --git a/test/replication/suite.cfg b/test/replication/suite.cfg
>>>>> index f357b07da..e21daa5ad 100644
>>>>> --- a/test/replication/suite.cfg
>>>>> +++ b/test/replication/suite.cfg
>>>>> @@ -1,6 +1,19 @@
>>>>>     {
>>>>>         "anon.test.lua": {},
>>>>> -    "misc.test.lua": {},
>>>>> + "misc_assert_connecting_master_twice_gh-3610.test.lua": {},
>>>>> +    "misc_assert_on_server_die_gh-2991.test.lua": {},
>>>>> + "misc_assert_replica_on_applier_disconnect_gh-3510.test.lua": {},
>>>>> + "misc_crash_on_box_concurrent_update_gh-3606.test.lua": {},
>>>>> +    "misc_heartbeats_on_master_changes_gh-3160.test.lua": {},
>>>>> + "misc_no_failure_on_error_reading_wal_gh-4399.test.lua": {},
>>>>> +    "misc_no_panic_on_connected_gh-3637.test.lua": {},
>>>>> + "misc_no_restart_on_same_configuration_gh-3711.test.lua": {},
>>>>> + "misc_no_socket_leak_on_replica_disconnect_gh-3642.test.lua": {},
>>>>> + "misc_orphan_on_reconfiguration_error_gh-4424.test.lua": {},
>>>>> +    "misc_rebootstrap_from_ro_master_gh-3111.test.lua": {},
>>>>> +    "misc_replica_checks_cluster_id_gh-3704.test.lua": {},
>>>>> +    "misc_return_on_quorum_0_gh-3760.test.lua": {},
>>>>> + "misc_value_not_replicated_on_iproto_request_gh-3247.test.lua": {},
>>>>>         "once.test.lua": {},
>>>>>         "on_replace.test.lua": {},
>>>>>         "status.test.lua": {},
>>>> -- 
>>>> Serge Petrenko
>>>>
-- 
Serge Petrenko