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Report expected contrecord length on mismatch

When reading a WAL record fails to find continuation record(s) of theproper length, report what it expects, for clarity.Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://postgr.es/m/20200903212152.GA15319@alvherre.pgsql

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src/backend/access/transam
- xlogreader.c

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`‎src/backend/access/transam/xlogreader.c`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -464,8 +464,9 @@ XLogReadRecord(XLogReaderState state, char *errormsg)`
`464`	`464`	`total_len!= (pageHeader->xlp_rem_len+gotlen))`
`465`	`465`	`{`
`466`	`466`	`report_invalid_record(state,`
`467`		`-"invalid contrecord length %u at %X/%X",`
	`467`	`+"invalid contrecord length %u(expected %lld)at %X/%X",`
`468`	`468`	`pageHeader->xlp_rem_len,`
	`469`	`+ ((long long)total_len)-gotlen,`
`469`	`470`	`(uint32) (RecPtr >>32), (uint32)RecPtr);`
`470`	`471`	`gotoerr;`
`471`	`472`	`}`

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Commitf43e295

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`‎src/backend/access/transam/xlogreader.c`

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