From: Robert Haas <rhaas@postgresql.org>
Date: Thu, 27 Oct 2016 18:27:40 +0000 (-0400)
Subject: If the stats collector dies during Hot Standby, restart it.
X-Git-Tag: REL_10_BETA1~1493
X-Git-Url: http://git.postgresql.org/gitweb/?a=commitdiff_plain;h=4f714b2fd2a580d909607de889ac822956eb8299;p=postgresql.git

If the stats collector dies during Hot Standby, restart it.

This bug exists as far back as 9.0, when Hot Standby was introduced,
so back-patch to all supported branches.

Report and patch by Takayuki Tsunakawa, reviewed by Michael Paquier
and Kuntal Ghosh.
---

diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index 2d43506cd0e..24add74512f 100644
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -1753,7 +1753,8 @@ ServerLoop(void)
 		}
 
 		/* If we have lost the stats collector, try to start a new one */
-		if (PgStatPID == 0 && pmState == PM_RUN)
+		if (PgStatPID == 0 &&
+			(pmState == PM_RUN || pmState == PM_HOT_STANDBY))
 			PgStatPID = pgstat_start();
 
 		/* If we have lost the archiver, try to start a new one. */
@@ -2963,7 +2964,7 @@ reaper(SIGNAL_ARGS)
 			if (!EXIT_STATUS_0(exitstatus))
 				LogChildExit(LOG, _("statistics collector process"),
 							 pid, exitstatus);
-			if (pmState == PM_RUN)
+			if (pmState == PM_RUN || pmState == PM_HOT_STANDBY)
 				PgStatPID = pgstat_start();
 			continue;
 		}