[Tarantool-patches] [PATCH 1/1] qsync: handle async txns right during CONFIRM

[Vladislav Shpilevoy]

Hi! Thanks for the review!

>> diff --git a/src/box/txn_limbo.c b/src/box/txn_limbo.c
>> index f287369a2..05f0bf30a 100644
>> --- a/src/box/txn_limbo.c
>> +++ b/src/box/txn_limbo.c
>> @@ -389,6 +389,27 @@ txn_limbo_read_confirm(struct txn_limbo *limbo, int64_t lsn)
>>                */
>>               if (e->lsn == -1)
>>                   break;
>> +        } else if (e->txn->signature < 0) {
>> +            /*
>> +             * A transaction might be covered by the CONFIRM even if
>> +             * it is not written to WAL yet when it is an async
>> +             * transaction. It could be created just when the
>> +             * CONFIRM was being written to WAL.
>> +             */
>> +            assert(e->txn->status == TXN_PREPARED);
>> +            /*
>> +             * Let it complete normally as a plain transaction.
>> +             */
>> +            txn_clear_flags(e->txn, TXN_WAIT_SYNC | TXN_WAIT_ACK);
> 
> AFAICS it's enough to clear WAIT_SYNC here.
> Asynchronous transactions never have WAIT_ACK set, do they?

Yes, sorry, I was in a big hurry when sent this patch. Fixed:

====================
@@ -400,7 +400,7 @@ txn_limbo_read_confirm(struct txn_limbo *limbo, int64_t lsn)
 			/*
 			 * Let it complete normally as a plain transaction.
 			 */
-			txn_clear_flags(e->txn, TXN_WAIT_SYNC | TXN_WAIT_ACK);
+			txn_clear_flags(e->txn, TXN_WAIT_SYNC);
 			txn_limbo_remove(limbo, e);