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MWL#136: Cross-engine consistency for START TRANSACTION WITH CONSISTENT SNAPSHOT

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Make the binlog handlerton participate in START TRANSACTION WITH CONSISTENT
SNAPSHOT, recording the binlog position corresponding to the snapshot taken
in other MVCC storage engines.

Expose this consistent binlog position as the new status variables
binlog_trx_file and binlog_trx_position. This enables to get a fully
non-locking snapshot of the database (including binlog position for
slave provisioning), avoiding the need for FLUSH TABLES WITH READ LOCK.

Modify mysqldump to detect if the server supports this new feature, and
if so, avoid FLUSH TABLES WITH READ LOCK for --single-transaction
--master-data snapshot backups.
This commit is contained in:
unknown
2010-11-07 22:37:43 +01:00
parent a2d921be36
commit 7322e38827
7 changed files with 511 additions and 45 deletions
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56
mysql-test/r/mysqldump-max.result
View File

@ -290,3 +290,59 @@ COUNT(*)
DROP VIEW v1;
DROP TABLE t1;
SET GLOBAL storage_engine=@old_engine;
# Connection default
RESET MASTER;
CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (a INT PRIMARY KEY, b INT) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1,0), (2,0);
SELECT GET_LOCK("block_queries_1", 120);
GET_LOCK("block_queries_1", 120)
1
# Connection c3
SELECT GET_LOCK("block_queries_2", 120);
GET_LOCK("block_queries_2", 120)
1
# Connection c1
SET @c= 0;
SELECT IF(@c<1, @c:=@c+1, GET_LOCK("block_queries_1", 120)) FROM t1 ORDER BY a;
# Connection c2
SET binlog_format="row";
SET @d= 10;
UPDATE t2 SET b=IF(@d<=10, @d:=@d+1, GET_LOCK("block_queries_2", 120)) ORDER BY a;
# Connection default
# Make sure other queries are running (and waiting).
SELECT RELEASE_LOCK("block_queries_1");
RELEASE_LOCK("block_queries_1")
1
# Connection c3
SELECT RELEASE_LOCK("block_queries_2");
RELEASE_LOCK("block_queries_2")
1
# Connection c1
IF(@c<1, @c:=@c+1, GET_LOCK("block_queries_1", 120))
1
1
# Connection c2
# Connection default
SELECT * FROM t2 ORDER BY a;
a b
1 11
2 1
DROP TABLE t1;
DROP TABLE t2;
SHOW BINLOG EVENTS LIMIT 6,3;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000001 524 Query 1 592 BEGIN
master-bin.000001 592 Query 1 689 use `test`; INSERT INTO t2 VALUES (1,0), (2,0)
master-bin.000001 689 Xid 1 716 COMMIT /* XID */
-- CHANGE MASTER TO MASTER_LOG_FILE='./master-bin.000001', MASTER_LOG_POS=716;
SELECT * FROM t1 ORDER BY a;
a
1
2
SELECT * FROM t2 ORDER BY a;
a b
1 0
2 0
DROP TABLE t1,t2;