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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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6
src/include/access/xlog_internal.h
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@@ -31,7 +31,7 @@
/*
* Each page of XLOG file has a header like this:
*/
#define XLOG_PAGE_MAGIC 0xD094 /* can be used as WAL version indicator */
#define XLOG_PAGE_MAGIC 0xD095 /* can be used as WAL version indicator */
typedef struct XLogPageHeaderData
{
@@ -266,6 +266,9 @@ typedef enum
* "VACUUM". rm_desc can then be called to obtain additional detail for the
* record, if available (e.g. the last block).
*
* rm_mask takes as input a page modified by the resource manager and masks
* out bits that shouldn't be flagged by wal_consistency_checking.
*
* RmgrTable[] is indexed by RmgrId values (see rmgrlist.h).
*/
typedef struct RmgrData
@@ -276,6 +279,7 @@ typedef struct RmgrData
const char *(*rm_identify) (uint8 info);
void (*rm_startup) (void);
void (*rm_cleanup) (void);
void (*rm_mask) (char *pagedata, BlockNumber blkno);
} RmgrData;
extern const RmgrData RmgrTable[];