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Binlog-in-engine: Implement savepoint support
Support for SAVEPOINT, ROLLBACK TO SAVEPOINT, rolling back a failed statement (keeping active transaction), and rolling back transaction. For savepoints (and start-of-statement), if the binlog data to be rolled back is still in the in-memory part of trx cache we can just truncate the cache to the point. But if we need to spill cache contents as out-of-band data containing one or more savepoints/start-of-statement point, then split the spill at each point and inform the engine of the savepoints. In InnoDB, at savepoint set, save the state of the forest of perfect binary trees being built. Then at rollback, restore the appropriate state. Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
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Kristian Nielsen
126
mysql-test/suite/binlog_in_engine/savepoint.test
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126
mysql-test/suite/binlog_in_engine/savepoint.test
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--source include/have_binlog_format_row.inc
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--source include/master-slave.inc
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--source include/have_innodb_binlog.inc
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CREATE TABLE t1 (i INT, a INT, b TEXT, PRIMARY KEY(i, a)) ENGINE=InnoDB;
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# ToDo CREATE TABLE t2 (i INT, a INT, b TEXT, PRIMARY KEY(i, a)) ENGINE=MyISAM;
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CREATE TABLE t2 (i INT, a INT, b TEXT, PRIMARY KEY(i, a)) ENGINE=InnoDB;
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# Add different amounts of data, to test various cases where event
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# groups fit or do not fit in case, are binlogged / not binlogged as
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# oob data.
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--let $i = 0
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while ($i <= 6) {
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if ($i == 0) {
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SET @b= REPEAT('$', 0);
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}
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if ($i == 1) {
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SET @b= REPEAT('$', 10);
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}
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if ($i == 2) {
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SET @b= REPEAT('$', 100);
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}
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if ($i == 3) {
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SET @b= REPEAT('$', 642);
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}
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if ($i == 4) {
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SET @b= REPEAT('$', 3930);
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}
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if ($i == 5) {
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SET @b= REPEAT('$', 16000);
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}
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if ($i == 6) {
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SET @b= REPEAT('$', 40000);
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}
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BEGIN;
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eval INSERT INTO t1 VALUES ($i, 1, @b);
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SAVEPOINT s1;
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eval INSERT INTO t1 VALUES ($i, 2, @b);
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SAVEPOINT s2;
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eval INSERT INTO t1 VALUES ($i, 3, @b);
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SAVEPOINT s3;
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eval INSERT INTO t1 VALUES ($i, 4, @b);
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ROLLBACK TO s2;
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eval INSERT INTO t1 VALUES ($i, 5, @b);
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ROLLBACK TO s2;
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eval INSERT INTO t1 VALUES ($i, 6, @b);
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SAVEPOINT s4;
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eval INSERT INTO t1 VALUES ($i, 7, @b);
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SAVEPOINT s5;
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ROLLBACK TO s5;
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eval INSERT INTO t1 VALUES ($i, 8, @b);
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COMMIT;
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eval SELECT a, length(b) FROM t1 WHERE i=$i ORDER BY a;
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BEGIN;
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eval INSERT INTO t1 VALUES ($i, 10, @b);
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SAVEPOINT s10;
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eval INSERT INTO t1 VALUES ($i, 11, @b);
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eval INSERT INTO t2 VALUES ($i, 12, @b);
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ROLLBACK TO s10;
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COMMIT;
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eval SELECT a, length(b) FROM t1 WHERE i=$i AND a>=10 ORDER BY a;
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eval SELECT a, length(b) FROM t2 WHERE i=$i ORDER BY a;
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# Test a full rollback.
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BEGIN;
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eval UPDATE t1 SET a=a+1000 WHERE i=$i;
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eval UPDATE t1 SET b='x' WHERE i=$i;
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ROLLBACK;
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# Test a statement that fails and is rolled back but the remaining
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# transaction is committed.
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BEGIN;
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eval INSERT INTO t1
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VALUES ($i, 101, @b), ($i, 102, @b), ($i, 103, @b), ($i, 104, @b), ($i, 105, @b);
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--error ER_DUP_ENTRY
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eval UPDATE t1 SET a=a-104 WHERE i=$i AND a > 100;
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eval UPDATE t1 SET a=a+10 WHERE i=$i AND a > 100;
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COMMIT;
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eval SELECT a, length(b) FROM t1 WHERE i=$i AND a >= 100 ORDER BY a;
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inc $i;
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}
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# Seeing the events generated useful for debugging, but hard to maintain the
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# .result file over time, better to check slave data vs. master.
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#--let $binlog_file= binlog-000000.ibb
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#--let $binlog_start= 4096
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#--source include/show_binlog_events.inc
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--let $master_checksum1= query_get_value(CHECKSUM TABLE t1, Checksum, 1)
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--let $master_checksum2= query_get_value(CHECKSUM TABLE t2, Checksum, 1)
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--source include/save_master_gtid.inc
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--connection slave
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--source include/sync_with_master_gtid.inc
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--let $slave_checksum1= query_get_value(CHECKSUM TABLE t1, Checksum, 1)
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--let slave_checksum2= query_get_value(CHECKSUM TABLE t2, Checksum, 1)
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--let $ok= 1
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if ($master_checksum1 != $slave_checksum1) {
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--let $ok= 0
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}
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if ($master_checksum2 != $slave_checksum2) {
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--let $ok= 0
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}
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if (!$ok) {
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--connection master
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--echo *** Data on master: ***
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SELECT i, a, length(b) FROM t1 ORDER BY i, a;
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SELECT i, a, length(b) FROM t2 ORDER BY i, a;
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--connection slave
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--echo *** Data on slave: ***
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SELECT i, a, length(b) FROM t1 ORDER BY i, a;
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SELECT i, a, length(b) FROM t2 ORDER BY i, a;
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--die Slave data differs from master. Master checksums $master_checksum1 $master_checksum2, but slave $slave_checksum1 $slave_checksum2
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}
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if ($ok) {
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--echo *** Slave data checksums with master, all ok. ***
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}
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--connection master
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DROP TABLE t1, t2;
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--source include/rpl_end.inc
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