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MDEV-4506: Parallel replication: Intermediate commit.

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Wait for all worker threads to finish when stopping the SQL thread.
(Only a basic wait; this still needs to be fixed to include timeout
logic as in sql_slave_killed()).
This commit is contained in:
unknown
2013-07-04 09:20:56 +02:00
parent 592e464a02
commit a1cfd47346
6 changed files with 38 additions and 5 deletions
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25
sql/rpl_parallel.cc
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@@ -21,6 +21,9 @@
the logic in sql_slave_killed() that waits for current event group to
complete needs to be extended appropriately...
- Audit the use of Relay_log_info::data_lock. Make sure it is held
correctly in all needed places also when using parallel replication.
- We need some user-configurable limit on how far ahead the SQL thread will
fetch and queue events for parallel execution (otherwise if slave gets
behind we will fill up memory with pending malloc()'ed events).
@@ -194,7 +197,11 @@ handle_rpl_parallel_thread(void *arg)
*/
mysql_mutex_lock(&entry->LOCK_parallel_entry);
if (entry->last_committed_sub_id < rgi->gtid_sub_id)
{
entry->last_committed_sub_id= rgi->gtid_sub_id;
if (entry->need_signal)
mysql_cond_broadcast(&entry->COND_parallel_entry);
}
mysql_mutex_unlock(&entry->LOCK_parallel_entry);
rgi->commit_orderer.wakeup_subsequent_commits();
@@ -463,12 +470,30 @@ rpl_parallel::find(uint32 domain_id)
}
mysql_mutex_init(key_LOCK_parallel_entry, &e->LOCK_parallel_entry,
MY_MUTEX_INIT_FAST);
mysql_cond_init(key_COND_parallel_entry, &e->COND_parallel_entry, NULL);
}
return e;
}
void
rpl_parallel::wait_for_done()
{
struct rpl_parallel_entry *e;
uint32 i;
for (i= 0; i < domain_hash.records; ++i)
{
e= (struct rpl_parallel_entry *)my_hash_element(&domain_hash, i);
mysql_mutex_lock(&e->LOCK_parallel_entry);
while (e->current_sub_id > e->last_commit_id)
mysql_cond_wait(&e->COND_parallel_entry, &e->LOCK_parallel_entry);
mysql_mutex_unlock(&e->LOCK_parallel_entry);
}
}
bool
rpl_parallel::do_event(struct rpl_group_info *serial_rgi, Log_event *ev,
THD *parent_thd)