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################################################################################
# BUG#20776314 THE CERTIFIER BROADCAST THREAD IS PRONE TO CONCURRENCY PROBLEMS
#
# This test fixes the first issue with the bug :
#
# If the garbage collection is in progress, we should discard all the
# incoming stable set message (certifier messages) as they will update the
# stable_gtid_set which will cause a concurrency problem.
#
# Test:
# 0. The test requires two servers: M1 and M2.
# 1. With both the members ONLINE. Commit a transaction (T1) on M1, that will
# be certified and applied on both members. Wait for first round of garbage
# collection to finish.
# 2. Stop GR on M2. Set DEBUG point to block garbage collection on M2. Start GR
# on M2.
# 3. Commit a transaction (T2) on M1, that will be certified and applied on both
# members. Wait for second round of garbage collection to finish on M1. Wait
# for the third round of garbage collection to finish on M2.
# 4. Clean up.
################################################################################
--source include/big_test.inc
--source include/have_debug.inc
--source include/have_group_replication_plugin.inc
--source include/group_replication.inc
--connection server1
--echo ############################################################
--echo # Commit a transaction (T1) on server 1, that will be
--echo # certified and applied on both members.
CREATE TABLE t1(i INT PRIMARY KEY);
--source include/rpl_sync.inc
--connection server1
--echo # Wait for the first round of garbage collection to finish on server 1.
--let $wait_timeout= 65
--let $wait_condition= SELECT Transactions_committed_all_members<>"" FROM performance_schema.replication_group_member_stats where member_id in (SELECT @@server_uuid)
--source include/wait_condition.inc
--connection server2
--echo # Wait for the first round of garbage collection to finish on server 2.
--let $wait_timeout= 65
--let $wait_condition= SELECT Transactions_committed_all_members<>"" FROM performance_schema.replication_group_member_stats where member_id in (SELECT @@server_uuid)
--source include/wait_condition.inc
--echo # First round of garbage collection finished
--let $first_garbage_collection_transactions_committed= `SELECT Transactions_committed_all_members from performance_schema.replication_group_member_stats where member_id in (SELECT @@server_uuid)`
--connection server2
--echo ############################################################
--echo # Block garbage collection on server 2.
--source include/stop_group_replication.inc
SET @debug_save= @@GLOBAL.DEBUG;
# Setting the debug flag for the garbage collection blocking.
SET @@GLOBAL.DEBUG= '+d,certifier_garbage_collection_block';
--source include/start_group_replication.inc
--connection server1
--echo ############################################################
--echo # Commit a transaction (T2) on server 1, that will be
--echo # certified and applied on both members.
INSERT INTO t1 VALUES(1);
--source include/rpl_sync.inc
--connection server1
--echo # Wait for the second round of garbage collection to finish on server 1.
--let $wait_timeout= 65
--let $wait_condition= SELECT Transactions_committed_all_members<>"$first_garbage_collection_transactions_committed" FROM performance_schema.replication_group_member_stats where member_id in (SELECT @@server_uuid)
--source include/wait_condition.inc
--connection server2
--echo # Wait for the third round of garbage collection to finish on server 2.
--echo # Round on which garbage collection will be unblocked.
# wait_timeout = 60 + 60 + 30 = 150
# 2nd GC 3rd GC extra
--let $wait_timeout= 150
--let $wait_condition= SELECT Transactions_committed_all_members<>"$first_garbage_collection_transactions_committed" FROM performance_schema.replication_group_member_stats where member_id in (SELECT @@server_uuid)
--source include/wait_condition.inc
# Cleanup
--connection server2
SET @@GLOBAL.DEBUG= @debug_save;
--connection server1
DROP TABLE t1;
--source include/group_replication_end.inc
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