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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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14
src/include/access/xlogrecord.h
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@ -56,8 +56,8 @@ typedef struct XLogRecord
/*
* The high 4 bits in xl_info may be used freely by rmgr. The
* XLR_SPECIAL_REL_UPDATE bit can be passed by XLogInsert caller. The rest
* are set internally by XLogInsert.
* XLR_SPECIAL_REL_UPDATE and XLR_CHECK_CONSISTENCY bits can be passed by
* XLogInsert caller. The rest are set internally by XLogInsert.
*/
#define XLR_INFO_MASK 0x0F
#define XLR_RMGR_INFO_MASK 0xF0
@ -70,6 +70,15 @@ typedef struct XLogRecord
*/
#define XLR_SPECIAL_REL_UPDATE 0x01
/*
* Enforces consistency checks of replayed WAL at recovery. If enabled,
* each record will log a full-page write for each block modified by the
* record and will reuse it afterwards for consistency checks. The caller
* of XLogInsert can use this value if necessary, but if
* wal_consistency_checking is enabled for a rmgr this is set unconditionally.
*/
#define XLR_CHECK_CONSISTENCY 0x02
/*
* Header info for block data appended to an XLOG record.
*
@ -137,6 +146,7 @@ typedef struct XLogRecordBlockImageHeader
/* Information stored in bimg_info */
#define BKPIMAGE_HAS_HOLE 0x01 /* page image has "hole" */
#define BKPIMAGE_IS_COMPRESSED 0x02 /* page image is compressed */
#define BKPIMAGE_APPLY 0x04 /* page image should be restored during replay */
/*
* Extra header information used when page image has "hole" and