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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 Paquierand Kuntal Ghosh.

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src/backend/postmaster
- postmaster.c

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`‎src/backend/postmaster/postmaster.c`

Lines changed: 3 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1753,7 +1753,8 @@ ServerLoop(void)`
`1753`	`1753`	`}`
`1754`	`1754`
`1755`	`1755`	`/* If we have lost the stats collector, try to start a new one */`
`1756`		`-if (PgStatPID==0&&pmState==PM_RUN)`
	`1756`	`+if (PgStatPID==0&&`
	`1757`	`+(pmState==PM_RUN\|\|pmState==PM_HOT_STANDBY))`
`1757`	`1758`	`PgStatPID=pgstat_start();`
`1758`	`1759`
`1759`	`1760`	`/* If we have lost the archiver, try to start a new one. */`
`@@ -2963,7 +2964,7 @@ reaper(SIGNAL_ARGS)`
`2963`	`2964`	`if (!EXIT_STATUS_0(exitstatus))`
`2964`	`2965`	`LogChildExit(LOG,_("statistics collector process"),`
`2965`	`2966`	`pid,exitstatus);`
`2966`		`-if (pmState==PM_RUN)`
	`2967`	`+if (pmState==PM_RUN\|\|pmState==PM_HOT_STANDBY)`
`2967`	`2968`	`PgStatPID=pgstat_start();`
`2968`	`2969`	`continue;`
`2969`	`2970`	`}`

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Commit4f714b2

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`‎src/backend/postmaster/postmaster.c`

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