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Check for two_phase change at end of process_syncing_tables_for_apply.

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Previously this function checked to see if we were ready to switch
to two_phase mode at its start, but that's silly: we should check
at the end, after we've done the work that might make us ready.
This simple change removes one sleep cycle from the time needed to
switch to two_phase mode.  In the real world that might not be
worth much, but it shaves a few seconds off the runtime for the
subscription test suite.

Nathan Bossart

Discussion: https://postgr.es/m/20221122004119.GA132961@nathanxps13
This commit is contained in:
Tom Lane 2023-01-06 15:35:31 -05:00
parent b1665bf01e
commit 4c032dd804
1 changed files with 29 additions and 22 deletions
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51
src/backend/replication/logical/tablesync.c
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@ -415,6 +415,7 @@ process_syncing_tables_for_apply(XLogRecPtr current_lsn)
static HTAB *last_start_times = NULL;
ListCell *lc;
bool started_tx = false;
bool should_exit = false;
Assert(!IsTransactionState());
@ -446,28 +447,6 @@ process_syncing_tables_for_apply(XLogRecPtr current_lsn)
last_start_times = NULL;
}
/*
* Even when the two_phase mode is requested by the user, it remains as
* 'pending' until all tablesyncs have reached READY state.
*
* When this happens, we restart the apply worker and (if the conditions
* are still ok) then the two_phase tri-state will become 'enabled' at
* that time.
*
* Note: If the subscription has no tables then leave the state as
* PENDING, which allows ALTER SUBSCRIPTION ... REFRESH PUBLICATION to
* work.
*/
if (MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_PENDING &&
AllTablesyncsReady())
{
ereport(LOG,
(errmsg("logical replication apply worker for subscription \"%s\" will restart so that two_phase can be enabled",
MySubscription->name)));
proc_exit(0);
}
/*
* Process all tables that are being synchronized.
*/
@ -619,9 +598,36 @@ process_syncing_tables_for_apply(XLogRecPtr current_lsn)
if (started_tx)
{
/*
* Even when the two_phase mode is requested by the user, it remains
* as 'pending' until all tablesyncs have reached READY state.
*
* When this happens, we restart the apply worker and (if the
* conditions are still ok) then the two_phase tri-state will become
* 'enabled' at that time.
*
* Note: If the subscription has no tables then leave the state as
* PENDING, which allows ALTER SUBSCRIPTION ... REFRESH PUBLICATION to
* work.
*/
if (MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_PENDING)
{
CommandCounterIncrement(); /* make updates visible */
if (AllTablesyncsReady())
{
ereport(LOG,
(errmsg("logical replication apply worker for subscription \"%s\" will restart so that two_phase can be enabled",
MySubscription->name)));
should_exit = true;
}
}
CommitTransactionCommand();
pgstat_report_stat(true);
}
if (should_exit)
proc_exit(0);
}
/*
@ -802,6 +808,7 @@ fetch_remote_table_info(char *nspname, char *relname,
TupleTableSlot *tslot;
Oid attrsRow[] = {INT2VECTOROID};
StringInfoData pub_names;
initStringInfo(&pub_names);
foreach(lc, MySubscription->publications)
{