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Error out on send failure in walsender loop.

I changed the loop in 9.3 to use "goto send_failure" instead of "break" onerrors, but I missed this one case. It was a relatively harmless bug: ifthe flush fails once it will most likely fail again as soon as we try toflush the output again. But it's a bug nevertheless.Report and fix by Andres Freund.

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src/backend/replication
- walsender.c

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`‎src/backend/replication/walsender.c‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1291,7 +1291,7 @@ WalSndLoop(void)`
`1291`	`1291`	`ping_sent= true;`
`1292`	`1292`	`/* Try to flush pending output to the client */`
`1293`	`1293`	`if (pq_flush_if_writable()!=0)`
`1294`		`-break;`
	`1294`	`+gotosend_failure;`
`1295`	`1295`	`}`
`1296`	`1296`	`}`
`1297`	`1297`

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Commit7558cc9

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`‎src/backend/replication/walsender.c‎`

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