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* [tarantool-patches] [v4 PATCH] replication: fix assertion with duplicate connection
@ 2018-09-30 13:27 Olga Arkhangelskaia
  2018-10-01 12:12 ` Vladimir Davydov
  0 siblings, 1 reply; 2+ messages in thread
From: Olga Arkhangelskaia @ 2018-09-30 13:27 UTC (permalink / raw)
  To: tarantool-patches; +Cc: Olga Arkhangelskaia

Patch fixes behavior when replica tries to connect to the same master
more than once. In case when it is initial configuration we raise the
exception. If it in not initial config we print the error and disconnect
the applier.

Closes #3610
---
https://github.com/tarantool/tarantool/issues/3610                              
https://github.com/tarantool/tarantool/tree/OKriw/gh-3610-assert_fail_when_connect_master_twice-1.10
                                                                                
v1:                                                                             
https://www.freelists.org/post/tarantool-patches/PATCH-box-fix-assertion-with-duplication-in-repl-source
                                                                                
v2:                                                                             
https://www.freelists.org/post/tarantool-patches/PATCH-v2-replication-fix-assertion-with-duplicated-connect-to-same-master

v3:
https://www.freelists.org/post/tarantool-patches/PATCH-v3-replication-fix-assertion-with-duplicate-connection
                                                                                
Changes in v2:                                                                  
- changed completely, now we let duplicated params to proceed                   
- stop the applier at the moment when replica has the same hash that other one  
- changed test

Changes in v3:                                                                  
- changed the wsy and order of how we clean up applier replica on duplication   
- test is now in misc.test.lua                                                  
- need to think over second test case

Changes in v4:
- added test case
- no changes in applier states or etc.
- appliers lwft in stopped states in case of dup. conf

 src/box/box.cc                    |   2 +-
 src/box/replication.cc            |   9 ++-
 test/replication/misc.result      | 115 ++++++++++++++++++++++++++++++++++++++
 test/replication/misc.test.lua    |  44 ++++++++++++++-
 test/replication/replica_dupl.lua |  10 ++++
 5 files changed, 176 insertions(+), 4 deletions(-)
 create mode 100644 test/replication/replica_dupl.lua

diff --git a/src/box/box.cc b/src/box/box.cc
index 804fc00e5..137b7ecd9 100644
--- a/src/box/box.cc
+++ b/src/box/box.cc
@@ -668,7 +668,7 @@ box_sync_replication(bool connect_quorum)
 
 	auto guard = make_scoped_guard([=]{
 		for (int i = 0; i < count; i++)
-			applier_delete(appliers[i]); /* doesn't affect diag */
+			applier_stop(appliers[i]);
 	});
 
 	replicaset_connect(appliers, count, connect_quorum);
diff --git a/src/box/replication.cc b/src/box/replication.cc
index 5755ad45e..462ab01fd 100644
--- a/src/box/replication.cc
+++ b/src/box/replication.cc
@@ -271,6 +271,8 @@ replica_on_applier_connect(struct replica *replica)
 	assert(replica->applier_sync_state == APPLIER_DISCONNECTED);
 
 	replica->uuid = applier->uuid;
+	replica->applier_sync_state = APPLIER_CONNECTED;
+	replicaset.applier.connected++;
 
 	struct replica *orig = replica_hash_search(&replicaset.hash, replica);
 	if (orig != NULL && orig->applier != NULL) {
@@ -290,6 +292,8 @@ replica_on_applier_connect(struct replica *replica)
 
 	if (orig != NULL) {
 		/* Use existing struct replica */
+		assert(orig->applier_sync_state == APPLIER_DISCONNECTED);
+		orig->applier_sync_state = replica->applier_sync_state;
 		replica_set_applier(orig, applier);
 		replica_clear_applier(replica);
 		replica_delete(replica);
@@ -299,8 +303,6 @@ replica_on_applier_connect(struct replica *replica)
 		replica_hash_insert(&replicaset.hash, replica);
 	}
 
-	replica->applier_sync_state = APPLIER_CONNECTED;
-	replicaset.applier.connected++;
 }
 
 static void
@@ -427,6 +429,7 @@ replicaset_update(struct applier **appliers, int count)
 	auto uniq_guard = make_scoped_guard([&]{
 		replica_hash_foreach_safe(&uniq, replica, next) {
 			replica_hash_remove(&uniq, replica);
+			replica_clear_applier(replica);
 			replica_delete(replica);
 		}
 	});
@@ -454,6 +457,8 @@ replicaset_update(struct applier **appliers, int count)
 		replica->uuid = applier->uuid;
 
 		if (replica_hash_search(&uniq, replica) != NULL) {
+			replica_clear_applier(replica);
+			replica_delete(replica);
 			tnt_raise(ClientError, ER_CFG, "replication",
 				  "duplicate connection to the same replica");
 		}
diff --git a/test/replication/misc.result b/test/replication/misc.result
index 0ac48ba34..c14883284 100644
--- a/test/replication/misc.result
+++ b/test/replication/misc.result
@@ -394,3 +394,118 @@ test_run:cmd("delete server replica_auth")
 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
+---
+...
+box.cfg{replication = {replication, replication}}
+---
+- error: 'Incorrect value for option ''replication'': duplicate connection to the
+    same replica'
+...
+test_run:cmd("switch default")
+---
+- true
+...
+box.schema.user.revoke('guest', 'replication')
+---
+...
+test_run:cmd("stop server replica")
+---
+- true
+...
+test_run:cmd('cleanup server replica')
+---
+- true
+...
+test_run:cmd("delete server replica")
+---
+- true
+...
+-- case when replica reconnects master with duplication in new configuration
+listen = box.cfg.listen
+---
+...
+box.schema.user.grant('guest', 'replication')
+---
+...
+test_run:cmd("create server replica_dupl with rpl_master=default, script='replication/replica_dupl.lua'")
+---
+- true
+...
+test_run:cmd("start server replica_dupl")
+---
+- true
+...
+test_run:cmd("switch replica_dupl")
+---
+- true
+...
+test_run:cmd("switch default")
+---
+- true
+...
+box.cfg{listen = ''}
+---
+...
+test_run:cmd("switch replica_dupl")
+---
+- true
+...
+replication = box.cfg.replication
+---
+...
+box.cfg{replication = {replication, replication}}
+---
+...
+test_run:cmd("switch default")
+---
+- true
+...
+box.cfg{listen = listen}
+---
+...
+fiber.sleep(1)
+---
+...
+test_run:cmd("switch replica_dupl")
+---
+- true
+...
+test_run:cmd("switch default")
+---
+- true
+...
+box.schema.user.revoke('guest', 'replication')
+---
+...
+test_run:cmd("stop server replica_dupl")
+---
+- true
+...
+test_run:cmd('cleanup server replica_dupl')
+---
+- true
+...
+test_run:cmd("delete server replica_dupl")
+---
+- true
+...
diff --git a/test/replication/misc.test.lua b/test/replication/misc.test.lua
index 56e1bab69..e070ebe57 100644
--- a/test/replication/misc.test.lua
+++ b/test/replication/misc.test.lua
@@ -161,5 +161,47 @@ _ = 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")
-
 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
+box.cfg{replication = {replication, replication}}
+
+test_run:cmd("switch default")
+box.schema.user.revoke('guest', 'replication')
+test_run:cmd("stop server replica")
+test_run:cmd('cleanup server replica')
+test_run:cmd("delete server replica")
+
+-- case when replica reconnects master with duplication in new configuration
+
+listen = box.cfg.listen
+box.schema.user.grant('guest', 'replication')
+test_run:cmd("create server replica_dupl with rpl_master=default, script='replication/replica_dupl.lua'")
+test_run:cmd("start server replica_dupl")
+test_run:cmd("switch replica_dupl")
+
+test_run:cmd("switch default")
+box.cfg{listen = ''}
+
+test_run:cmd("switch replica_dupl")
+replication = box.cfg.replication
+box.cfg{replication = {replication, replication}}
+
+test_run:cmd("switch default")
+box.cfg{listen = listen}
+fiber.sleep(1)
+test_run:cmd("switch replica_dupl")
+
+test_run:cmd("switch default")
+box.schema.user.revoke('guest', 'replication')
+test_run:cmd("stop server replica_dupl")
+test_run:cmd('cleanup server replica_dupl')
+test_run:cmd("delete server replica_dupl")
diff --git a/test/replication/replica_dupl.lua b/test/replication/replica_dupl.lua
new file mode 100644
index 000000000..29e94551d
--- /dev/null
+++ b/test/replication/replica_dupl.lua
@@ -0,0 +1,10 @@
+#!/usr/bin/env tarantool
+
+box.cfg({
+    replication         = os.getenv("MASTER"),
+    memtx_memory        = 107374182,
+    replication_connect_quorum=0,
+    replication_connect_timeout = 0.1,
+})
+
+require('console').listen(os.getenv('ADMIN'))
-- 
2.14.3 (Apple Git-98)

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2018-09-30 13:27 [tarantool-patches] [v4 PATCH] replication: fix assertion with duplicate connection Olga Arkhangelskaia
2018-10-01 12:12 ` Vladimir Davydov

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