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# ==== Purpose and Implementation ==== # Set binlog_group_commit_sync_delay to 1~9. # case1) Have binlog_group_commit_sync_no_delay_count > 1, and the number of # transaction commits less than binlog_group_commit_sync_no_delay_count, these # commits should not hang forever if no more commits come in; # case2) If binlog_group_commit_sync_no_delay_count = 0 transaction commits # should not hang forever; # # ==== References ==== # # Bug#22891628: BINARY GROUP COMMIT HANGS WHEN BINLOG_GROUP_COMMIT_SYNC_DELAY # IS SET TO 1~9 # ############################################################################### --source include/have_log_bin.inc CREATE TABLE t(id INT PRIMARY KEY, v INT NOT NULL) ENGINE INNODB; INSERT INTO t VALUES(1, 100), (2, 100), (3, 100), (4, 100); --let $bgcd_saved=`SELECT @@GLOBAL.binlog_group_commit_sync_delay` ##################### begin of case 1 ###################### SET GLOBAL binlog_group_commit_sync_delay = 8; SET GLOBAL binlog_group_commit_sync_no_delay_count = 2; BEGIN; UPDATE t set v = v + 100 WHERE id = 1; COMMIT; # hangs here forever if no more commits come in ###################### end of case 1 ####################### ##################### begin of case 2 ###################### SET GLOBAL binlog_group_commit_sync_delay = 8; SET GLOBAL binlog_group_commit_sync_no_delay_count = 0; BEGIN; UPDATE t set v = v + 100 WHERE id = 3; COMMIT; # hangs here forever ###################### end of case 2 ####################### --eval SET GLOBAL binlog_group_commit_sync_delay=$bgcd_saved DROP TABLE t;