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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
commit 8672339328
41 changed files with 245 additions and 267 deletions
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38
mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result
View file

@ -3395,20 +3395,6 @@ NUMERIC_BLOCK_SIZE 1
ENUM_VALUE_LIST NULL
READ_ONLY YES
COMMAND_LINE_ARGUMENT REQUIRED
VARIABLE_NAME REPLICATE_ALLOW_PARALLEL
SESSION_VALUE ON
GLOBAL_VALUE NULL
GLOBAL_VALUE_ORIGIN COMPILE-TIME
DEFAULT_VALUE ON
VARIABLE_SCOPE SESSION ONLY
VARIABLE_TYPE BOOLEAN
VARIABLE_COMMENT If set when a transaction is written to the binlog, that transaction is allowed to replicate in parallel on a slave where slave_parallel_mode is set to "transactional". Can be cleared for transactions that are likely to cause a conflict if replicated in parallel, to avoid unnecessary rollback and retry.
NUMERIC_MIN_VALUE NULL
NUMERIC_MAX_VALUE NULL
NUMERIC_BLOCK_SIZE NULL
ENUM_VALUE_LIST OFF,ON
READ_ONLY NO
COMMAND_LINE_ARGUMENT NULL
VARIABLE_NAME REPLICATE_ANNOTATE_ROW_EVENTS
SESSION_VALUE NULL
GLOBAL_VALUE OFF
@ -3675,6 +3661,20 @@ NUMERIC_BLOCK_SIZE NULL
ENUM_VALUE_LIST OFF,ON
READ_ONLY YES
COMMAND_LINE_ARGUMENT OPTIONAL
VARIABLE_NAME SKIP_PARALLEL_REPLICATION
SESSION_VALUE OFF
GLOBAL_VALUE NULL
GLOBAL_VALUE_ORIGIN COMPILE-TIME
DEFAULT_VALUE OFF
VARIABLE_SCOPE SESSION ONLY
VARIABLE_TYPE BOOLEAN
VARIABLE_COMMENT If set when a transaction is written to the binlog, parallel apply of that transaction will be avoided on a slave where slave_parallel_mode is not "aggressive". Can be used to avoid unnecessary rollback and retry for transactions that are likely to cause a conflict if replicated in parallel.
NUMERIC_MIN_VALUE NULL
NUMERIC_MAX_VALUE NULL
NUMERIC_BLOCK_SIZE NULL
ENUM_VALUE_LIST OFF,ON
READ_ONLY NO
COMMAND_LINE_ARGUMENT NULL
VARIABLE_NAME SKIP_REPLICATION
SESSION_VALUE OFF
GLOBAL_VALUE NULL
@ -3817,16 +3817,16 @@ READ_ONLY NO
COMMAND_LINE_ARGUMENT REQUIRED
VARIABLE_NAME SLAVE_PARALLEL_MODE
SESSION_VALUE NULL
GLOBAL_VALUE domain,follow_master_commit
GLOBAL_VALUE conservative
GLOBAL_VALUE_ORIGIN COMPILE-TIME
DEFAULT_VALUE domain,follow_master_commit
DEFAULT_VALUE conservative
VARIABLE_SCOPE GLOBAL
VARIABLE_TYPE SET
VARIABLE_COMMENT Controls what transactions are applied in parallel when using --slave-parallel-threads. Syntax: slave_parallel_mode=value[,value...], where "value" could be one or more of: "domain", to apply different replication domains in parallel; "follow_master_commit", to apply in parallel transactions that group-committed together on the master; "transactional", to optimistically try to apply all transactional DML in parallel; and "waiting" to extend "transactional" to even transactions that had to wait on the master.
VARIABLE_TYPE ENUM
VARIABLE_COMMENT Controls what transactions are applied in parallel when using --slave-parallel-threads. Possible values: "optimistic" tries to apply most transactional DML in parallel, and handles any conflicts with rollback and retry. "conservative" limits parallelism in an effort to avoid any conflicts. "aggressive" tries to maximise the parallelism, possibly at the cost of increased conflict rate. "minimal" only parallelizes the commit steps of transactions. "none" disables parallel apply completely.
NUMERIC_MIN_VALUE NULL
NUMERIC_MAX_VALUE NULL
NUMERIC_BLOCK_SIZE NULL
ENUM_VALUE_LIST domain,follow_master_commit,transactional,waiting
ENUM_VALUE_LIST none,minimal,conservative,optimistic,aggressive
READ_ONLY NO
COMMAND_LINE_ARGUMENT NULL
VARIABLE_NAME SLAVE_PARALLEL_THREADS