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# === Purpose === # # When binlog_order_commits is off then binlog rotate will wait for 'm_prep_xids' decrease to zero. # However 'm_prep_xids' is decreased before update thd's GTID to 'executed_gtids' so GTID may be missed # in the next binlog file's Previous_gtids event (see function MYSQL_BIN_LOG::finish_commit) # # ==== Requirements ==== # # R1. Client transactions are guaranteed to have monotonically increasing GTIDs # without gaps between the generated numbers. # # === Implementation ==== # # Ensure GTID XID is decreased after commit # 1. Create table t1. GTID 1 # 2. Insert into t1. GTID 2 in a new connection. Stop after commit and decrease XID. # 3. Insert into t1. GTID 3. Rotate log file. XID 1-3 should be used in 'master-bin.000002'. # 4. Check GTID are used out by looking at log file 'master-bin.000002'. # # === References === # # BUG #34930969 Contribution by Tencent: Previous_gtids miss gtid when binlog_order_commits off # --source include/have_debug.inc --source include/have_innodb.inc --source include/have_debug.inc --source include/have_gtid.inc --source include/have_log_bin.inc --echo # --echo # Use default connection to master. --echo # --connection default RESET MASTER; SET @old_binlog_order_commits = @@global.binlog_order_commits; SET GLOBAL binlog_order_commits = 0; --echo # --echo # Create table. Use GTID 1 --echo # CREATE TABLE t1 (id INT PRIMARY KEY); --echo # --echo # Make another connection. Set to stop at after dec_prep_xids. --echo # --connect(con1,localhost,root,,) SET DEBUG_SYNC = "after_dec_prep_xids SIGNAL signal.after_dec_prep_xids_reached WAIT_FOR signal.after_dec_prep_xids_unblock"; --echo # --echo # Use GTID 2. Stop after dec_prep_xids. If commit is executed before --echo # dec_prep_xids then GTID 2 will be used out. --echo # --send INSERT INTO t1 VALUES(1); --echo # --echo # Use default connection to master. --echo # --connection default --echo # --echo # Wait until after_dec_prep_xids is reached --echo # SET DEBUG_SYNC = "now WAIT_FOR signal.after_dec_prep_xids_reached"; --echo # --echo # Use GTID 3. Force to rotate to log 'master-bin.000002' --echo # All GTID 1-3 should be used in 'master-bin.000001' --echo # SET SESSION debug = "+d,force_rotate"; INSERT INTO t1 VALUES(2); SET SESSION debug = "-d,force_rotate"; --echo # --echo # Add transaction in new binary log 'master-bin.000002' --echo # GTID 4 should be used. --echo # SET DEBUG_SYNC = 'now SIGNAL signal.after_dec_prep_xids_unblock'; INSERT INTO t1 VALUES(3); --echo # --echo # Check all GTID 1-3 are used by looking at 'master-bin.000002' --echo # --let $assert_cond = \'[\'SHOW BINLOG EVENTS IN "master-bin.000002" LIMIT 1, 1\', Info, 1]\' LIKE \'%1-3\' --let $assert_text = Previous_gtids should use UUID:1-3 GTID --source include/assert.inc --echo # --echo # Cleanup --echo # DROP TABLE t1; SET GLOBAL binlog_order_commits = @old_binlog_order_commits;