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MDEV-4506: Parallel replication: intermediate commit.

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Fix a bunch of issues found with locking, ordering, and non-thread-safe stuff
in Relay_log_info.

Now able to do a simple benchmark, showing 4.5 times speedup for applying a
binlog with 10000 REPLACE statements.
This commit is contained in:
unknown
2013-07-08 16:47:07 +02:00
parent e654be3865
commit a99356fbe7
8 changed files with 109 additions and 65 deletions
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11
sql/rpl_parallel.h
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@ -60,6 +60,15 @@ struct rpl_parallel_entry {
mysql_cond_t COND_parallel_entry;
uint64 current_sub_id;
struct rpl_group_info *current_group_info;
/*
The sub_id of the last event group in the previous batch of group-committed
transactions.
When we spawn parallel worker threads for the next group-committed batch,
they first need to wait for this sub_id to be committed before it is safe
to start executing them.
*/
uint64 prev_groupcommit_sub_id;
};
struct rpl_parallel {
HASH domain_hash;
@ -69,7 +78,7 @@ struct rpl_parallel {
~rpl_parallel();
rpl_parallel_entry *find(uint32 domain_id);
void wait_for_done();
bool do_event(struct rpl_group_info *serial_rgi, Log_event *ev, THD *thd);
bool do_event(struct rpl_group_info *serial_rgi, Log_event *ev);
};