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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 ../inc/have_group_replication_plugin.inc --source ../inc/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 --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 --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` --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 --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 --source include/wait_condition.inc # Cleanup --connection server2 SET @@GLOBAL.DEBUG= @debug_save; --connection server1 DROP TABLE t1; --source ../inc/group_replication_end.inc