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Avoid starting walreceiver in states where it shouldn't be running.

In particular, it's bad to start walreceiver when in statePM_WAIT_BACKENDS, because we have no provision to kill walreceiverwhen in that state.Fujii Masao

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src/backend/postmaster
- postmaster.c

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`‎src/backend/postmaster/postmaster.c‎`

Lines changed: 4 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -37,7 +37,7 @@`
`37`	`37`	`*`
`38`	`38`	`*`
`39`	`39`	`* IDENTIFICATION`
`40`		`- * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.609 2010/05/26 12:32:41 rhaas Exp $`
	`40`	`+ * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.610 2010/05/27 02:01:37 rhaas Exp $`
`41`	`41`	`*`
`42`	`42`	`* NOTES`
`43`	`43`	`*`
`@@ -4217,7 +4217,9 @@ sigusr1_handler(SIGNAL_ARGS)`
`4217`	`4217`	`}`
`4218`	`4218`
`4219`	`4219`	`if (CheckPostmasterSignal(PMSIGNAL_START_WALRECEIVER)&&`
`4220`		`-WalReceiverPID==0)`
	`4220`	`+WalReceiverPID==0&&`
	`4221`	`+(pmState==PM_STARTUP\|\|pmState==PM_RECOVERY\|\|`
	`4222`	`+pmState==PM_HOT_STANDBY\|\|pmState==PM_WAIT_READONLY))`
`4221`	`4223`	`{`
`4222`	`4224`	`/* Startup Process wants us to start the walreceiver process. */`
`4223`	`4225`	`WalReceiverPID=StartWalReceiver();`

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Commit5e85315

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`‎src/backend/postmaster/postmaster.c‎`

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