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Add WAL consistency checking facility.

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When the new GUC wal_consistency_checking is set to a non-empty value,
it triggers recording of additional full-page images, which are
compared on the standby against the results of applying the WAL record
(without regard to those full-page images).  Allowable differences
such as hints are masked out, and the resulting pages are compared;
any difference results in a FATAL error on the standby.

Kuntal Ghosh, based on earlier patches by Michael Paquier and Heikki
Linnakangas.  Extensively reviewed and revised by Michael Paquier and
by me, with additional reviews and comments from Amit Kapila, Álvaro
Herrera, Simon Riggs, and Peter Eisentraut.
This commit is contained in:
Robert Haas
2017-02-08 15:45:30 -05:00
parent 115cb31597
commit a507b86900
36 changed files with 811 additions and 48 deletions
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21
src/backend/access/spgist/spgxlog.c
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@ -14,6 +14,7 @@
*/
#include "postgres.h"
#include "access/bufmask.h"
#include "access/spgist_private.h"
#include "access/transam.h"
#include "access/xlog.h"
@ -1023,3 +1024,23 @@ spg_xlog_cleanup(void)
MemoryContextDelete(opCtx);
opCtx = NULL;
}
/*
* Mask a SpGist page before performing consistency checks on it.
*/
void
spg_mask(char *pagedata, BlockNumber blkno)
{
Page page = (Page) pagedata;
mask_page_lsn(page);
mask_page_hint_bits(page);
/*
* Any SpGist page other than meta contains unused space which needs to be
* masked.
*/
if (!SpGistPageIsMeta(page))
mask_unused_space(page);
}