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Minor fixes for WAL consistency checking.

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Michael Paquier, reviewed and slightly revised by me.

Discussion: http://postgr.es/m/CAB7nPqRzCQb=vdfHvMtP0HMLBHU6z1aGdo4GJsUP-HP8jx+Pkw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-02-14 12:41:01 -05:00
parent e28b115612
commit fb47544d0c
4 changed files with 13 additions and 4 deletions
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12
src/backend/access/transam/xlog.c
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@ -1360,6 +1360,16 @@ checkXLogConsistency(XLogReaderState *record)
Assert(XLogRecHasBlockImage(record, block_id));
if (XLogRecBlockImageApply(record, block_id))
{
/*
* WAL record has already applied the page, so bypass the
* consistency check as that would result in comparing the full
* page stored in the record with itself.
*/
continue;
}
/*
* Read the contents from the current buffer and store it in a
* temporary page.
@ -1390,7 +1400,7 @@ checkXLogConsistency(XLogReaderState *record)
/*
* Read the contents from the backup copy, stored in WAL record and
* store it in a temporary page. There is not need to allocate a new
* store it in a temporary page. There is no need to allocate a new
* page here, a local buffer is fine to hold its contents and a mask
* can be directly applied on it.
*/