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MDEV-6676: Optimistic parallel replication

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Adjust the configuration options, as discussed on the
maria-developers@ mailing list.

The option to hint a transaction to not be replicated in parallel is
now called @@skip_parallel_replication, consistent with
@@skip_replication.

And the --slave-parallel-mode is now simplified to have just one of
the following values:

  none
  minimal
  conservative
  optimistic
  aggressive

This reflects successively harder efforts to find opportunities to run
things in parallel on the slave. It allows to extend the server with
more automatic heuristics in the future without having to introduce a
new configuration option for each and every one.
This commit is contained in:
Kristian Nielsen
2015-02-06 10:02:02 +01:00
parent 734c4c0143
commit 8672339328
41 changed files with 243 additions and 265 deletions
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10
mysql-test/suite/rpl/t/rpl_parallel_optimistic.test
View File

@ -15,7 +15,7 @@ SET @old_parallel_threads=@@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=10;
CHANGE MASTER TO master_use_gtid=slave_pos;
SET @old_parallel_mode=@@GLOBAL.slave_parallel_mode;
SET GLOBAL slave_parallel_mode='domain,transactional';
SET GLOBAL slave_parallel_mode='optimistic';
--connection server_1
@ -106,7 +106,7 @@ SELECT * FROM t3 ORDER BY c;
#SHOW STATUS LIKE 'Slave_retried_transactions';
--echo *** Test @@replicate_allow_parallel. ***
--echo *** Test @@skip_parallel_replication. ***
--connection server_2
--source include/stop_slave.inc
@ -114,11 +114,11 @@ SELECT * FROM t3 ORDER BY c;
--connection server_1
# We do a bunch of conflicting transactions on the master with
# replicate_allow_parallel set to false, and check that we do not
# skip_parallel_replication set to true, and check that we do not
# get any retries on the slave.
UPDATE t1 SET b=10 WHERE a=3;
SET SESSION replicate_allow_parallel=0;
SET SESSION skip_parallel_replication=1;
UPDATE t1 SET b=20 WHERE a=3;
UPDATE t1 SET b=30 WHERE a=3;
UPDATE t1 SET b=50 WHERE a=3;
@ -128,7 +128,7 @@ UPDATE t1 SET b=210 WHERE a=3;
UPDATE t1 SET b=340 WHERE a=3;
UPDATE t1 SET b=550 WHERE a=3;
UPDATE t1 SET b=890 WHERE a=3;
SET SESSION replicate_allow_parallel=1;
SET SESSION skip_parallel_replication=0;
SELECT * FROM t1 ORDER BY a;
--source include/save_master_gtid.inc