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MDEV-5289: master server starts slave parallel threads

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Delay spawning parallel replication worker threads until a slave SQL
thread is running, and de-spawn them when the last SQL thread stops.

This is especially useful to avoid needless threads on a master in a
setup where same my.cnf is used on masters and slaves.
This commit is contained in:
Kristian Nielsen
2015-03-11 09:18:16 +01:00
parent a7fd11b31d
commit ed04c40b01
11 changed files with 116 additions and 53 deletions
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6
sql/rpl_parallel.h
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@ -204,7 +204,6 @@ struct rpl_parallel_thread_pool {
struct rpl_parallel_thread *free_list;
mysql_mutex_t LOCK_rpl_thread_pool;
mysql_cond_t COND_rpl_thread_pool;
bool changing;
bool inited;
rpl_parallel_thread_pool();
@ -314,9 +313,8 @@ struct rpl_parallel {
extern struct rpl_parallel_thread_pool global_rpl_thread_pool;
extern int rpl_parallel_change_thread_count(rpl_parallel_thread_pool *pool,
uint32 new_count,
bool skip_check= false);
extern int rpl_parallel_activate_pool(rpl_parallel_thread_pool *pool);
extern int rpl_parallel_inactivate_pool(rpl_parallel_thread_pool *pool);
extern bool process_gtid_for_restart_pos(Relay_log_info *rli, rpl_gtid *gtid);
#endif /* RPL_PARALLEL_H */