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MDEV-5262: Missing retry after temp error in parallel replication

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Start implementing that an event group can be re-tried in parallel replication
if it fails with a temporary error (like deadlock).

Patch is very incomplete, just some very basic retry works.

Stuff still missing (not complete list):

 - Handle moving to the next relay log file, if event group to be retried
   spans multiple relay log files.

 - Handle refcounting of relay log files, to ensure that we do not purge a
   relay log file and then later attempt to re-execute events out of it.

 - Handle description_event_for_exec - we need to save this somehow for the
   possible retry - and use the correct one in case it differs between relay
   logs.

 - Do another retry attempt in case the first retry also fails.

 - Limit the max number of retries.

 - Lots of testing will be needed for the various edge cases.
This commit is contained in:
unknown
2014-05-08 14:20:18 +02:00
committed by Kristian Nielsen
parent 2b4b857d51
commit b0b60f2498
8 changed files with 394 additions and 18 deletions
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62
mysql-test/suite/rpl/r/rpl_parallel_retry.result Normal file
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@ -0,0 +1,62 @@
include/rpl_init.inc [topology=1->2]
*** Test retry of transactions that fail to replicate due to deadlock or similar temporary error. ***
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t1 (a int PRIMARY KEY, b INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,1);
SET sql_log_bin=0;
CREATE FUNCTION foo(x INT, d1 VARCHAR(500), d2 VARCHAR(500))
RETURNS INT DETERMINISTIC
BEGIN
RETURN x;
END
||
SET sql_log_bin=1;
SET @old_parallel_threads=@@GLOBAL.slave_parallel_threads;
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=5;
include/start_slave.inc
SET sql_log_bin=0;
CREATE FUNCTION foo(x INT, d1 VARCHAR(500), d2 VARCHAR(500))
RETURNS INT DETERMINISTIC
BEGIN
IF d1 != '' THEN
SET debug_sync = d1;
END IF;
IF d2 != '' THEN
SET debug_sync = d2;
END IF;
RETURN x;
END
||
include/stop_slave.inc
SET @old_format= @@SESSION.binlog_format;
SET binlog_format='statement';
SET gtid_seq_no = 100;
BEGIN;
INSERT INTO t1 VALUES (2,1);
UPDATE t1 SET b=b+1 WHERE a=1;
INSERT INTO t1 VALUES (3,1);
COMMIT;
SET binlog_format=@old_format;
SELECT * FROM t1 ORDER BY a;
a b
1 2
2 1
3 1
SET @old_dbug= @@GLOBAL.debug_dbug;
SET GLOBAL debug_dbug="+d,rpl_parallel_simulate_temp_err_gtid_0_1_100";
include/start_slave.inc
SET GLOBAL debug_dbug=@old_dbug;
retries
1
SELECT * FROM t1 ORDER BY a;
a b
1 2
2 1
3 1
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=@old_parallel_threads;
include/start_slave.inc
DROP TABLE t1;
DROP function foo;
include/rpl_end.inc