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* [Tarantool-patches] [PATCH 1/1] replication: check rs uuid on subscribe process
@ 2021-05-28 20:35 Vladislav Shpilevoy via Tarantool-patches
  2021-05-28 22:06 ` Cyrill Gorcunov via Tarantool-patches
  2021-06-01  8:29 ` Serge Petrenko via Tarantool-patches
  0 siblings, 2 replies; 11+ messages in thread
From: Vladislav Shpilevoy via Tarantool-patches @ 2021-05-28 20:35 UTC (permalink / raw)
  To: tarantool-patches, gorcunov, sergepetrenko

Remote node doing the subscribe might be from a different
replicaset.

Before this patch the subscribe would be retried infinitely
because the node couldn't be found in _cluster, and the master
assumed it must have joined to another node, and its ID should
arrive shortly (ER_TOO_EARLY_SUBSCRIBE).

The ID would never arrive, because the node belongs to another
replicaset.

The patch makes so the master checks if the peer lives in the same
replicaset. Since it is doing a subscribe, it must have joined
already and should have a valid replicaser UUID, regardless of
whether it is anonymous or not.

Correct behaviour is to hard cut this peer off immediately,
without retries.

Closes #6094
Part of #5613
---
Branch: http://github.com/tarantool/tarantool/tree/gerold103/gh-6094-replication-bad-error
Issue: https://github.com/tarantool/tarantool/issues/6094

The UUID ignorance on subscribe decode was introduced here:
https://github.com/tarantool/tarantool/commit/7f8cbde3555084ad6c41f137aec4faba4648c705#diff-fc276b44b551b4eac3431c9433d4bc881790ddd7df76226d7579f80da7798f6e

And I don't understand why. Maybe I miss something? The tests have
passed. Sergey, do you remember why was it needed really?

Replicaset UUID mismatch definitely means the node can't connect.
It is not related to whether it is anonymous or not. Because it
has nothing to do with _cluster.

 .../unreleased/gh-6094-rs-uuid-mismatch.md    |  6 ++
 src/box/box.cc                                | 17 ++++-
 .../gh-6094-rs-uuid-mismatch.result           | 67 +++++++++++++++++++
 .../gh-6094-rs-uuid-mismatch.test.lua         | 25 +++++++
 test/replication/suite.cfg                    |  1 +
 5 files changed, 114 insertions(+), 2 deletions(-)
 create mode 100644 changelogs/unreleased/gh-6094-rs-uuid-mismatch.md
 create mode 100644 test/replication/gh-6094-rs-uuid-mismatch.result
 create mode 100644 test/replication/gh-6094-rs-uuid-mismatch.test.lua

diff --git a/changelogs/unreleased/gh-6094-rs-uuid-mismatch.md b/changelogs/unreleased/gh-6094-rs-uuid-mismatch.md
new file mode 100644
index 000000000..f4e47da3d
--- /dev/null
+++ b/changelogs/unreleased/gh-6094-rs-uuid-mismatch.md
@@ -0,0 +1,6 @@
+## bugfix/replication
+
+* Fixed an error when a replica, at attempt to subscribe to a foreign cluster
+  (with different replicaset UUID), didn't notice it is not possible, and
+  instead was stuck in an infinite retry loop printing an error about "too
+  early subscribe" (gh-6094).
diff --git a/src/box/box.cc b/src/box/box.cc
index c10e0d8bf..5672073d6 100644
--- a/src/box/box.cc
+++ b/src/box/box.cc
@@ -2686,17 +2686,30 @@ box_process_subscribe(struct ev_io *io, struct xrow_header *header)
 		tnt_raise(ClientError, ER_LOADING);
 
 	struct tt_uuid replica_uuid = uuid_nil;
+	struct tt_uuid peer_replicaset_uuid = uuid_nil;
 	struct vclock replica_clock;
 	uint32_t replica_version_id;
 	vclock_create(&replica_clock);
 	bool anon;
 	uint32_t id_filter;
-	xrow_decode_subscribe_xc(header, NULL, &replica_uuid, &replica_clock,
-				 &replica_version_id, &anon, &id_filter);
+	xrow_decode_subscribe_xc(header, &peer_replicaset_uuid, &replica_uuid,
+				 &replica_clock, &replica_version_id, &anon,
+				 &id_filter);
 
 	/* Forbid connection to itself */
 	if (tt_uuid_is_equal(&replica_uuid, &INSTANCE_UUID))
 		tnt_raise(ClientError, ER_CONNECTION_TO_SELF);
+	/*
+	 * The peer should have bootstrapped from somebody since it tries to
+	 * subscribe already. If it belongs to a different replicaset, it won't
+	 * be ever found here, and would try to reconnect thinking its replica
+	 * ID wasn't replicated here yet. Prevent it right away.
+	 */
+	if (!tt_uuid_is_equal(&peer_replicaset_uuid, &REPLICASET_UUID)) {
+		tnt_raise(ClientError, ER_REPLICASET_UUID_MISMATCH,
+			  tt_uuid_str(&REPLICASET_UUID),
+			  tt_uuid_str(&peer_replicaset_uuid));
+	}
 
 	/*
 	 * Do not allow non-anonymous followers for anonymous
diff --git a/test/replication/gh-6094-rs-uuid-mismatch.result b/test/replication/gh-6094-rs-uuid-mismatch.result
new file mode 100644
index 000000000..1ba189a37
--- /dev/null
+++ b/test/replication/gh-6094-rs-uuid-mismatch.result
@@ -0,0 +1,67 @@
+-- test-run result file version 2
+test_run = require('test_run').new()
+ | ---
+ | ...
+
+--
+-- gh-6094: master instance didn't check if the subscribed instance has the same
+-- replicaset UUID as its own. As a result, if the peer is from a different
+-- replicaset, the master couldn't find its record in _cluster, and assumed it
+-- simply needs to wait a bit more. This led to an infinite re-subscribe.
+--
+box.schema.user.grant('guest', 'super')
+ | ---
+ | ...
+
+test_run:cmd('create server master2 with script="replication/master1.lua"')
+ | ---
+ | - true
+ | ...
+test_run:cmd('start server master2')
+ | ---
+ | - true
+ | ...
+test_run:switch('master2')
+ | ---
+ | - true
+ | ...
+replication = test_run:eval('default', 'return box.cfg.listen')[1]
+ | ---
+ | ...
+box.cfg{replication = {replication}}
+ | ---
+ | ...
+assert(test_run:grep_log('master2', 'ER_REPLICASET_UUID_MISMATCH'))
+ | ---
+ | - ER_REPLICASET_UUID_MISMATCH
+ | ...
+info = box.info
+ | ---
+ | ...
+repl_info = info.replication[1]
+ | ---
+ | ...
+assert(not repl_info.downstream and not repl_info.upstream)
+ | ---
+ | - true
+ | ...
+assert(info.status == 'orphan')
+ | ---
+ | - true
+ | ...
+
+test_run:switch('default')
+ | ---
+ | - true
+ | ...
+test_run:cmd('stop server master2')
+ | ---
+ | - true
+ | ...
+test_run:cmd('delete server master2')
+ | ---
+ | - true
+ | ...
+box.schema.user.revoke('guest', 'super')
+ | ---
+ | ...
diff --git a/test/replication/gh-6094-rs-uuid-mismatch.test.lua b/test/replication/gh-6094-rs-uuid-mismatch.test.lua
new file mode 100644
index 000000000..d3928f52b
--- /dev/null
+++ b/test/replication/gh-6094-rs-uuid-mismatch.test.lua
@@ -0,0 +1,25 @@
+test_run = require('test_run').new()
+
+--
+-- gh-6094: master instance didn't check if the subscribed instance has the same
+-- replicaset UUID as its own. As a result, if the peer is from a different
+-- replicaset, the master couldn't find its record in _cluster, and assumed it
+-- simply needs to wait a bit more. This led to an infinite re-subscribe.
+--
+box.schema.user.grant('guest', 'super')
+
+test_run:cmd('create server master2 with script="replication/master1.lua"')
+test_run:cmd('start server master2')
+test_run:switch('master2')
+replication = test_run:eval('default', 'return box.cfg.listen')[1]
+box.cfg{replication = {replication}}
+assert(test_run:grep_log('master2', 'ER_REPLICASET_UUID_MISMATCH'))
+info = box.info
+repl_info = info.replication[1]
+assert(not repl_info.downstream and not repl_info.upstream)
+assert(info.status == 'orphan')
+
+test_run:switch('default')
+test_run:cmd('stop server master2')
+test_run:cmd('delete server master2')
+box.schema.user.revoke('guest', 'super')
diff --git a/test/replication/suite.cfg b/test/replication/suite.cfg
index dc39e2f74..5acb28fd4 100644
--- a/test/replication/suite.cfg
+++ b/test/replication/suite.cfg
@@ -45,6 +45,7 @@
     "gh-5435-qsync-clear-synchro-queue-commit-all.test.lua": {},
     "gh-5536-wal-limit.test.lua": {},
     "gh-5566-final-join-synchro.test.lua": {},
+    "gh-6094-rs-uuid-mismatch.test.lua": {},
     "*": {
         "memtx": {"engine": "memtx"},
         "vinyl": {"engine": "vinyl"}
-- 
2.24.3 (Apple Git-128)


^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2021-06-03  7:18 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-28 20:35 [Tarantool-patches] [PATCH 1/1] replication: check rs uuid on subscribe process Vladislav Shpilevoy via Tarantool-patches
2021-05-28 22:06 ` Cyrill Gorcunov via Tarantool-patches
2021-05-28 22:20   ` Vladislav Shpilevoy via Tarantool-patches
2021-05-28 22:30     ` Cyrill Gorcunov via Tarantool-patches
2021-06-01  7:52     ` Cyrill Gorcunov via Tarantool-patches
2021-06-01  8:29 ` Serge Petrenko via Tarantool-patches
2021-06-01 21:34   ` Vladislav Shpilevoy via Tarantool-patches
2021-06-02  6:36     ` Serge Petrenko via Tarantool-patches
2021-06-02 20:16       ` Vladislav Shpilevoy via Tarantool-patches
2021-06-03  7:14         ` Serge Petrenko via Tarantool-patches
2021-06-03  7:18         ` Serge Petrenko via Tarantool-patches

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