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MDEV-5289: master server starts slave parallel threads

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Delay spawning parallel replication worker threads until a slave SQL
thread is running, and de-spawn them when the last SQL thread stops.

This is especially useful to avoid needless threads on a master in a
setup where same my.cnf is used on masters and slaves.
This commit is contained in:
Kristian Nielsen
2015-03-11 09:18:16 +01:00
parent a7fd11b31d
commit ed04c40b01
11 changed files with 116 additions and 53 deletions
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14
mysql-test/suite/rpl/r/rpl_parallel.result
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@@ -4,8 +4,22 @@ SET GLOBAL slave_parallel_threads=10;
ERROR HY000: This operation cannot be performed as you have a running slave ''; run STOP SLAVE '' first
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=10;
SELECT IF(COUNT(*) < 10, "OK", CONCAT("Found too many system user processes: ", COUNT(*))) FROM information_schema.processlist WHERE user = "system user";
IF(COUNT(*) < 10, "OK", CONCAT("Found too many system user processes: ", COUNT(*)))
OK
CHANGE MASTER TO master_use_gtid=slave_pos;
include/start_slave.inc
SELECT IF(COUNT(*) >= 10, "OK", CONCAT("Found too few system user processes: ", COUNT(*))) FROM information_schema.processlist WHERE user = "system user";
IF(COUNT(*) >= 10, "OK", CONCAT("Found too few system user processes: ", COUNT(*)))
OK
include/stop_slave.inc
SELECT IF(COUNT(*) < 10, "OK", CONCAT("Found too many system user processes: ", COUNT(*))) FROM information_schema.processlist WHERE user = "system user";
IF(COUNT(*) < 10, "OK", CONCAT("Found too many system user processes: ", COUNT(*)))
OK
include/start_slave.inc
SELECT IF(COUNT(*) >= 10, "OK", CONCAT("Found too few system user processes: ", COUNT(*))) FROM information_schema.processlist WHERE user = "system user";
IF(COUNT(*) >= 10, "OK", CONCAT("Found too few system user processes: ", COUNT(*)))
OK
*** Test long-running query in domain 1 can run in parallel with short queries in domain 0 ***
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t1 (a int PRIMARY KEY) ENGINE=MyISAM;