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# # Bug#49907: ALTER TABLE ... TRUNCATE PARTITION # does not wait for locks on the table # CREATE TABLE t1 (a INT) ENGINE = InnoDB PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN (15), PARTITION pMax VALUES LESS THAN MAXVALUE); INSERT INTO t1 VALUES (1), (11), (21), (33); BEGIN; DELETE FROM t1 WHERE a = 11; SELECT * FROM t1; a 1 21 33 # con1 (send) ALTER TABLE t1 TRUNCATE PARTITION pMax; # con default SELECT * FROM t1; a 1 21 33 # Commit will allow the TRUNCATE to finish COMMIT; # con1 (reap) # con1 (disconnect) # default connection SELECT * FROM t1; a 1 DROP TABLE t1; # # Bug#50561: ALTER PARTITIONS does not have adequate lock, breaks with # concurrent I_S query create table t1 (a int) engine = innodb stats_persistent=0 partition by range (a) (partition p0 values less than MAXVALUE); insert into t1 values (1), (11), (21), (33); SELECT * FROM t1; a 1 11 21 33 SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0 /*!50100 PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN MAXVALUE ENGINE = InnoDB) */ t1#P#p0.ibd t1.frm SET DEBUG_SYNC='before_open_in_get_all_tables SIGNAL parked WAIT_FOR open'; SET DEBUG_SYNC='partition_open_error SIGNAL alter WAIT_FOR finish'; SELECT TABLE_SCHEMA, TABLE_NAME, PARTITION_NAME, PARTITION_ORDINAL_POSITION, PARTITION_DESCRIPTION, TABLE_ROWS FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_NAME = 't1' AND TABLE_SCHEMA = 'test'; SET DEBUG_SYNC = 'now WAIT_FOR parked'; # When waiting for the name lock in get_all_tables in sql_show.cc # this will not be concurrent any more, thus the TIMEOUT SET DEBUG_SYNC = 'before_handle_alter_part_end SIGNAL open WAIT_FOR alter TIMEOUT 1'; # Needs to be executed twice, since first is this 'SET DEBUG_SYNC ...' SET DEBUG_SYNC = 'before_close_thread_tables SIGNAL finish EXECUTE 2'; ALTER TABLE t1 REORGANIZE PARTITION p0 INTO (PARTITION p0 VALUES LESS THAN (10), PARTITION p10 VALUES LESS THAN MAXVALUE); Warnings: Warning 1639 debug sync point wait timed out TABLE_SCHEMA TABLE_NAME PARTITION_NAME PARTITION_ORDINAL_POSITION PARTITION_DESCRIPTION TABLE_ROWS test t1 p0 1 10 1 test t1 p10 2 MAXVALUE 3 t1#P#p0.ibd t1#P#p10.ibd t1.frm SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0 /*!50100 PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN (10) ENGINE = InnoDB, PARTITION p10 VALUES LESS THAN MAXVALUE ENGINE = InnoDB) */ SELECT * FROM t1; a 1 11 21 33 drop table t1; SET DEBUG_SYNC = 'RESET';