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add additional sync finish condition check to fix infinite catchup status #447

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add additional sync finish condition check to fix infinite catchup status #447

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31 changes: 31 additions & 0 deletions pglogical_apply.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1485,7 +1485,38 @@ apply_work(PGconn *streamConn)
send_feedback(applyconn, last_received, GetCurrentTimestamp(), false);

if (!in_remote_transaction)
{
process_syncing_tables(last_received);

/* checking whether sync can finish.
* If sync process synced very closely to the remote,
* there is a possibility that no commit after the start point.
* If that is the case, sync/apply workers are infinitely waiting a commit to finish.
* This can happened when `alter_subscription_resynchronize_table()` called
* randomly.
* To address that issue, we can evaluate sync finish condition here */
if (MyPGLogicalWorker->worker_type == PGLOGICAL_WORKER_SYNC &&
MyApplyWorker->replay_stop_lsn != InvalidXLogRecPtr &&
last_received >= MyApplyWorker->replay_stop_lsn) {
StartTransactionCommand();
/*
* In case there is nothing to catchup, finish immediately.
* Note pglogical_sync_worker_finish() will commit.
*/
/* Mark local table as done. */
set_table_sync_status(MyApplyWorker->subid,
NameStr(MyPGLogicalWorker->worker.sync.nspname),
NameStr(MyPGLogicalWorker->worker.sync.relname),
SYNC_STATUS_SYNCDONE, last_received);
CommitTransactionCommand();
PQfinish(applyconn);
pglogical_sync_worker_finish();

/* stop process */
proc_exit(0);
}
}


/* We must not have switched out of MessageContext by mistake */
Assert(CurrentMemoryContext == MessageContext);
Expand Down