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Commit8e971a4

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michaelpqpull[bot]
authored andcommitted
Tweak pg_promote() to report failures on kill() or postmaster failures
Since its introduction in1007465, pg_promote() has been returninga false status in three cases:- SIGUSR1 not sent to the postmaster process.- Postmaster death during standby promotion.- Standby not promoted within the specified wait time.An application calling this function will have a hard time understandingwhat a false state returned actually means.Per discussion, this switches the two first states to fail rather thanreturn a "false" status, making the second case more consistent with theexisting CHECK_FOR_INTERRUPTS in the wait loop. False is only returnedwhen the promotion is not completed within the specified time (60s bydefault).Author: Ashutosh SharmaReviewed-by: Fujii Masao, Laurenz Albe, Michael PaquierDiscussion:https://postgr.es/m/CAE9k0P=QTrwptL0t4J0fuBRDDjgsT-0PVKd-ikd96i1hyL7Bcg@mail.gmail.com
1 parent61ba865 commit8e971a4

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‎src/backend/access/transam/xlogfuncs.c

Lines changed: 7 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -711,10 +711,10 @@ pg_promote(PG_FUNCTION_ARGS)
711711
/* signal the postmaster */
712712
if (kill(PostmasterPid,SIGUSR1)!=0)
713713
{
714-
ereport(WARNING,
715-
(errmsg("failed to send signal to postmaster: %m")));
716714
(void)unlink(PROMOTE_SIGNAL_FILE);
717-
PG_RETURN_BOOL(false);
715+
ereport(ERROR,
716+
(errcode(ERRCODE_SYSTEM_ERROR),
717+
errmsg("failed to send signal to postmaster: %m")));
718718
}
719719

720720
/* return immediately if waiting was not requested */
@@ -744,7 +744,10 @@ pg_promote(PG_FUNCTION_ARGS)
744744
* necessity for manual cleanup of all postmaster children.
745745
*/
746746
if (rc&WL_POSTMASTER_DEATH)
747-
PG_RETURN_BOOL(false);
747+
ereport(FATAL,
748+
(errcode(ERRCODE_ADMIN_SHUTDOWN),
749+
errmsg("terminating connection due to unexpected postmaster exit"),
750+
errcontext("while waiting on promotion")));
748751
}
749752

750753
ereport(WARNING,

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