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pg_upgrade: Upgrade an Assert to a real 'if' test

It seems possible for the condition being tested to be true inproduction, and nobody would never know (except when some dataeventually becomes corrupt?).Author: Álvaro Herrera <alvherre@alvh.no-ip.org>Discussion:https://postgr.es/m//202109040001.zky3wgv2qeqg@alvherre.pgsql

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src/bin/pg_rewind
- parsexlog.c

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`‎src/bin/pg_rewind/parsexlog.c`

Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -102,7 +102,9 @@ extractPageMap(const char *datadir, XLogRecPtr startpoint, int tliIndex,`
`102`	`102`	`* If 'endpoint' didn't point exactly at a record boundary, the caller`
`103`	`103`	`* messed up.`
`104`	`104`	`*/`
`105`		`-Assert(xlogreader->EndRecPtr==endpoint);`
	`105`	`+if (xlogreader->EndRecPtr!=endpoint)`
	`106`	`+pg_fatal("end pointer %X/%X is not a valid end point; expected %X/%X",`
	`107`	`+LSN_FORMAT_ARGS(endpoint),LSN_FORMAT_ARGS(xlogreader->EndRecPtr));`
`106`	`108`
`107`	`109`	`XLogReaderFree(xlogreader);`
`108`	`110`	`if (xlogreadfd!=-1)`

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Commit3e1c942

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`‎src/bin/pg_rewind/parsexlog.c`

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