[PATCH v3] replication: fix exit with ER_NO_SUCH_USER during bootstrap

[Vladimir Davydov]

On Fri, Aug 24, 2018 at 02:56:45PM +0300, Serge Petrenko wrote:
> When replication is configured via some user created in box.once()
> function and box.once() takes more than replication_timeout seconds
> to execute, appliers recieve ER_NO_SUCH_USER error, which they don't
> handle. This leads to occasional test failures in replication suite.
> Fix this by handling the aforementioned case in applier_f() and add a
> test case.
> 
> Closes #3637
> ---
> https://github.com/tarantool/tarantool/issues/3637
> https://github.com/tarantool/tarantool/tree/sp/gh-3637-replication-tests-fix

The issue was reassigned to 1.9. Please rebase.

> diff --git a/test/replication/autobootstrap.test.lua b/test/replication/autobootstrap.test.lua
> index 752d5f317..21417a738 100644
> --- a/test/replication/autobootstrap.test.lua
> +++ b/test/replication/autobootstrap.test.lua

IMHO we'd better put this small test case in replication/misc, because
it's not really about cluster autobootstrap.

> @@ -108,3 +108,31 @@ _ = test_run:cmd("switch default")
>  -- Stop servers
>  --
>  test_run:drop_cluster(SERVERS)
> +
> +--
> +-- Test case for gh-3637. Before the fix replica would exit with
> +-- an error. Now check that we don't hang and successfully connect.
> +--
> +fiber = require("fiber")
> +
> +test_run:cmd("setopt delimiter ';'")
> +function wait_replica()
> +    while box.info.replication[2] == nil do
> +        fiber.sleep(0.01)
> +    end
> +end;
> +test_run:cmd("setopt delimiter ''");

Please use test_run:wait_vclock instead.

> +
> +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 0.1'")

I'd set the timeout to 0.01 to make sure replica tries to reconnect
several times before it succeeds.

> +-- Wait a bit to make sure replica waits till user is created.
> +fiber.sleep(0.1)
> +box.schema.user.create('cluster', {password='pass'})
> +box.schema.user.grant('cluster', 'replication')
> +wait_replica()
> +
> +test_run:cmd("stop server replica_auth")
> +test_run:cmd("cleanup server replica_auth")
> +test_run:cmd("delete server replica_auth")
> +
> +box.schema.user.drop('cluster')