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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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30
mysql-test/suite/sys_vars/r/slave_parallel_mode_basic.result
View File

@ -1,8 +1,8 @@
SET SESSION slave_parallel_mode= '';
SET SESSION slave_parallel_mode= none;
ERROR HY000: Variable 'slave_parallel_mode' is a GLOBAL variable and should be set with SET GLOBAL
SELECT @@slave_parallel_mode;
@@slave_parallel_mode
domain
minimal
SELECT @@m1.slave_parallel_mode;
@@m1.slave_parallel_mode
NULL
@ -12,39 +12,39 @@ Warning 1617 There is no master connection 'm1'
CHANGE MASTER TO master_host='127.0.0.1', master_port=3310, master_user='root';
SELECT @@``.slave_parallel_mode;
@@``.slave_parallel_mode
domain
minimal
SELECT @@slave_parallel_mode;
@@slave_parallel_mode
domain
Parallel_Mode = 'domain'
minimal
Parallel_Mode = 'minimal'
SELECT @@m2.slave_parallel_mode;
@@m2.slave_parallel_mode
NULL
Warnings:
Warning 1617 There is no master connection 'm2'
Warning 1617 There is no master connection 'm2'
SET GLOBAL m2.slave_parallel_mode = '';
SET GLOBAL m2.slave_parallel_mode = none;
Warnings:
Warning 1617 There is no master connection 'm2'
CHANGE MASTER 'm1' TO master_host='127.0.0.1', master_port=3311, master_user='root';
SELECT @@m1.slave_parallel_mode;
@@m1.slave_parallel_mode
transactional
Parallel_Mode = 'domain'
SET GLOBAL m1.slave_parallel_mode= follow_master_commit;
Parallel_Mode = 'domain'
optimistic
Parallel_Mode = 'minimal'
SET GLOBAL m1.slave_parallel_mode= conservative;
Parallel_Mode = 'minimal'
SET default_master_connection= 'm1';
SELECT @@slave_parallel_mode;
@@slave_parallel_mode
follow_master_commit
SET GLOBAL slave_parallel_mode= waiting;
conservative
SET GLOBAL slave_parallel_mode= aggressive;
SELECT @@slave_parallel_mode;
@@slave_parallel_mode
waiting
Parallel_Mode = 'waiting'
aggressive
Parallel_Mode = 'aggressive'
SET default_master_connection= '';
SELECT @@slave_parallel_mode;
@@slave_parallel_mode
domain
minimal
RESET SLAVE ALL;
RESET SLAVE 'm1' ALL;