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MDEV-4506: Parallel replication.

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Implement --slave-parallel-max-queue to limit memory usage
of SQL thread read-ahead in the relay log.
This commit is contained in:
unknown
2013-10-24 12:44:21 +02:00
parent 96a4f1f628
commit ee8a816208
9 changed files with 113 additions and 27 deletions
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25
sql/rpl_parallel.h
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@ -27,7 +27,29 @@ struct rpl_parallel_thread {
char event_relay_log_name[FN_REFLEN];
char future_event_master_log_name[FN_REFLEN];
ulonglong event_relay_log_pos;
size_t event_size;
} *event_queue, *last_in_queue;
uint64 queued_size;
void enqueue(queued_event *qev)
{
if (last_in_queue)
last_in_queue->next= qev;
else
event_queue= qev;
last_in_queue= qev;
queued_size+= qev->event_size;
}
void dequeue(queued_event *list)
{
queued_event *tmp;
DBUG_ASSERT(list == event_queue);
event_queue= last_in_queue= NULL;
for (tmp= list; tmp; tmp= tmp->next)
queued_size-= tmp->event_size;
}
};
@ -87,7 +109,8 @@ struct rpl_parallel {
void reset();
rpl_parallel_entry *find(uint32 domain_id);
void wait_for_done();
bool do_event(rpl_group_info *serial_rgi, Log_event *ev);
bool do_event(rpl_group_info *serial_rgi, Log_event *ev,
ulonglong event_size);
};