Re: releasing ParallelApplyTxnHash when pa_launch_parallel_worker returns NULL - Mailing list pgsql-hackers

On Tue, Jan 10, 2023 at 9:26 AM Ted Yu <yuzhihong@gmail.com> wrote:

On Tue, Jan 10, 2023 at 9:25 AM Ted Yu <yuzhihong@gmail.com> wrote:

Hi,

I was reading src/backend/replication/logical/applyparallelworker.c .

In `pa_allocate_worker`, when pa_launch_parallel_worker returns NULL, I think the `ParallelApplyTxnHash` should be released.

Please see the patch.

Thanks

Here is the patch :-) 

In `pa_process_spooled_messages_if_required`, the `pa_unlock_stream` call immediately follows `pa_lock_stream`.

I assume the following is the intended sequence of calls. If this is the case, I can add it to the patch.

Cheers

diff --git a/src/backend/replication/logical/applyparallelworker.c b/src/backend/replication/logical/applyparallelworker.c
index 2e5914d5d9..9879b3fff2 100644
--- a/src/backend/replication/logical/applyparallelworker.c
+++ b/src/backend/replication/logical/applyparallelworker.c
@@ -684,9 +684,9 @@ pa_process_spooled_messages_if_required(void)
     if (fileset_state == FS_SERIALIZE_IN_PROGRESS)
     {
         pa_lock_stream(MyParallelShared->xid, AccessShareLock);
-        pa_unlock_stream(MyParallelShared->xid, AccessShareLock);

         fileset_state = pa_get_fileset_state();
+        pa_unlock_stream(MyParallelShared->xid, AccessShareLock);
     }

     /*