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Don't abort pg_basebackup when receiving empty WAL block

This is a similar fix as c6ec8793aa59d1842082e14b4b4aae7d4bd883fd9.2. This should never happen in 9.3 and newer since the special casecannot happen there, but this patch synchronizes up the code so thereis no confusion on why they're different. An empty block is as harmlessin 9.3 as it was in 9.2, and can safely be ignored.

1 parent001e114 commit705556aCopy full SHA for 705556a

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src/bin/pg_basebackup
- receivelog.c

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`‎src/bin/pg_basebackup/receivelog.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -989,7 +989,7 @@ HandleCopyStream(PGconn *conn, XLogRecPtr startpos, uint32 timeline,`
`989`	`989`	`hdr_len+=8;/* dataStart */`
`990`	`990`	`hdr_len+=8;/* walEnd */`
`991`	`991`	`hdr_len+=8;/* sendTime */`
`992`		`-if (r<hdr_len+1)`
	`992`	`+if (r<hdr_len)`
`993`	`993`	`{`
`994`	`994`	`fprintf(stderr,_("%s: streaming header too small: %d\n"),`
`995`	`995`	`progname,r);`

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Commit705556a

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`‎src/bin/pg_basebackup/receivelog.c`

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