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MDEV-6676: Optimistic parallel replication

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Implement a new mode for parallel replication. In this mode, all transactions
are optimistically attempted applied in parallel. In case of conflicts, the
offending transaction is rolled back and retried later non-parallel.

This is an early-release patch to facilitate testing, more changes to user
interface / options will be expected. The new mode is not enabled by default.
This commit is contained in:
Kristian Nielsen
2014-12-05 16:09:48 +01:00
parent 1e3f09f163
commit db21fddc37
55 changed files with 2596 additions and 466 deletions
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24
sql/rpl_parallel.h
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@ -49,7 +49,29 @@ struct group_commit_orderer {
uint64 wait_count;
group_commit_orderer *prev_gco;
group_commit_orderer *next_gco;
bool installed;
/*
This flag is set when this GCO has been installed into the next_gco pointer
of the previous GCO.
*/
static const uint8 INSTALLED = 0x01;
/*
This flag is set for a GCO in which we have event groups with multiple
different commit_id values from the master. This happens when we
optimistically try to execute in parallel transactions not known to be
conflict-free.
When this flag is set, in case of DDL we need to start a new GCO regardless
of current commit_id, as DDL is not safe to speculatively apply in parallel
with prior event groups.
*/
static const uint8 MULTI_BATCH = 0x02;
/*
This flag is set for a GCO that contains DDL. If set, it forces a switch to
a new GCO upon seeing a new commit_id, as DDL is not safe to speculatively
replicate in parallel with subsequent transactions.
*/
static const uint8 FORCE_SWITCH = 0x04;
uint8 flags;
};