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Added syntax and implementation for BACKUP STAGE's
Part of MDEV-5336 Implement LOCK FOR BACKUP - Changed check of Global_only_lock to also include BACKUP lock. - We store latest MDL_BACKUP_DDL lock in thd->mdl_backup_ticket to be able to downgrade lock during copy_data_between_tables()
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Monty
221
mysql-test/main/backup_lock.result
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mysql-test/main/backup_lock.result
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#
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# Testing which locks we get from all stages
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#
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BACKUP STAGE START;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_START Backup lock
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BACKUP STAGE FLUSH;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_FLUSH Backup lock
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BACKUP STAGE BLOCK_DDL;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_WAIT_DDL Backup lock
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BACKUP STAGE BLOCK_COMMIT;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_WAIT_COMMIT Backup lock
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BACKUP STAGE END;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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#
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# testing BACKUP STAGE LOCK's
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#
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connect con1,localhost,root,,;
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connect con2,localhost,root,,;
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connection default;
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#
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# testing if BACKUP STAGE FLUSH causes deadlocks with ALTER TABLE
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#
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create table t1 (a int) engine=innodb;
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start transaction;
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insert into t1 values (1);
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connection con1;
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alter table t1 add column (j int), algorithm copy;
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connection con2;
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backup stage start;
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backup stage flush;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_DDL Backup lock
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MDL_BACKUP_FLUSH Backup lock
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MDL_SHARED_WRITE Table metadata lock test t1
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MDL_SHARED_UPGRADABLE Table metadata lock test t1
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MDL_INTENTION_EXCLUSIVE Schema metadata lock test
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SET STATEMENT max_statement_time=1 FOR backup stage block_ddl;
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ERROR 70100: Query execution was interrupted (max_statement_time exceeded)
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backup stage block_ddl;
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connection default;
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commit;
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SELECT * FROM t1;
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a
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1
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SET STATEMENT lock_wait_timeout=0 FOR INSERT INTO t1 values (2);
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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INSERT INTO t1 values (2,0);;
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connection con2;
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backup stage end;
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connection con1;
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connection default;
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select * from t1;
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a j
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1 NULL
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2 0
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drop table t1;
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# Test with inline alter table, which doesn't block block_commit
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create table t1 (a int) engine=innodb;
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start transaction;
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insert into t1 values (1);
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connection con1;
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alter table t1 add column (j int);
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connection con2;
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backup stage start;
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backup stage flush;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_ALTER_COPY Backup lock
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MDL_BACKUP_FLUSH Backup lock
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MDL_SHARED_WRITE Table metadata lock test t1
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MDL_SHARED_UPGRADABLE Table metadata lock test t1
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MDL_INTENTION_EXCLUSIVE Schema metadata lock test
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backup stage block_ddl;
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backup stage block_commit;
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connection default;
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SELECT * FROM t1;
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a
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1
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commit;
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connection con2;
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backup stage end;
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connection con1;
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connection default;
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drop table t1;
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#
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# testing if BACKUP STAGE FLUSH causes deadlocks with DROP TABLE
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#
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create table t1 (a int) engine=innodb;
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start transaction;
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insert into t1 values (1);
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connection con1;
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SET STATEMENT lock_wait_timeout=0 FOR DROP TABLE t1;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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DROP TABLE t1;
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connection con2;
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backup stage start;
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backup stage flush;
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SET STATEMENT lock_wait_timeout=0 FOR SELECT * FROM t1;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SET STATEMENT lock_wait_timeout=0 FOR backup stage block_ddl;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_DDL Backup lock
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MDL_BACKUP_FLUSH Backup lock
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MDL_SHARED_WRITE Table metadata lock test t1
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MDL_INTENTION_EXCLUSIVE Schema metadata lock test
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backup stage end;
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connection default;
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commit;
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connection con1;
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connection default;
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#
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# Check if backup stage block_dll + concurrent drop table blocks select
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#
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create table t1 (a int) engine=innodb;
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backup stage start;
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backup stage block_ddl;
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connection con1;
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DROP TABLE t1;
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connection con2;
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connection con2;
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SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
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LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
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MDL_BACKUP_WAIT_DDL Backup lock
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SELECT * FROM t1;
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a
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connection default;
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backup stage end;
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connection con1;
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connection default;
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#
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# Check if backup stage block_dll overrides ddl lock for drop table
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#
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create table t1 (a int) engine=innodb;
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start transaction;
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insert into t1 values (1);
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connection con1;
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SET STATEMENT lock_wait_timeout=0 FOR DROP TABLE t1;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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DROP TABLE t1;
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connection con2;
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backup stage start;
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backup stage flush;
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backup stage block_ddl;
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connection default;
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commit;
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connection con2;
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backup stage end;
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connection con1;
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connection default;
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#
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# Check if BACKUP STAGE BLOCK_COMMIT blocks commit
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#
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create table t1 (a int) engine=innodb;
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start transaction;
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insert into t1 values (1);
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connection con1;
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backup stage start;
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backup stage block_commit;
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connection default;
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commit;
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connection con1;
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backup stage end;
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connection default;
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select * from t1;
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a
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1
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drop table t1;
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disconnect con1;
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disconnect con2;
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#
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# Test backup stage and flush tables
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#
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BACKUP STAGE START ;
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BACKUP STAGE BLOCK_DDL ;
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FLUSH TABLES;
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CREATE TEMPORARY TABLE t12345678_tmp (col1 INT);
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drop table t12345678_tmp;
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BACKUP STAGE END;
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#
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# Test BACKUP STAGES with lock timeouts
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#
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SET GLOBAL lock_wait_timeout=0;
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CREATE TABLE t_permanent_innodb (col1 INT) ENGINE = InnoDB;
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CREATE TABLE t_permanent_myisam (col1 INT) ENGINE = MyISAM;
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INSERT INTO t_permanent_innodb SET col1 = 1;
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INSERT INTO t_permanent_myisam SET col1 = 1;
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CREATE TABLE t_con1_innodb (col1 INT) ENGINE = InnoDB;
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CREATE TABLE t_con1_myisam (col1 INT) ENGINE = MyISAM;
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connect con1,localhost,root,,;
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SET AUTOCOMMIT = 0;
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connection default;
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BACKUP STAGE START;
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BACKUP STAGE FLUSH;
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BACKUP STAGE BLOCK_DDL;
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BACKUP STAGE BLOCK_COMMIT;
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connection con1;
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UPDATE t_permanent_innodb SET col1 = 8;
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UPDATE t_permanent_myisam SET col1 = 8;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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DROP TABLE t_con1_innodb;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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DROP TABLE t_con1_myisam;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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connection default;
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BACKUP STAGE END;
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DROP TABLE t_permanent_myisam, t_permanent_innodb;
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DROP TABLE t_con1_innodb, t_con1_myisam;
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disconnect con1;
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set global lock_wait_timeout=default;
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