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由 Ashwin Agrawal 提交于
This is majorly backport of Postgres commit. ------------------------------------------------ commit a507b869 Author: Robert Haas <rhaas@postgresql.org> Date: Wed Feb 8 15:45:30 2017 -0500 Add WAL consistency checking facility. 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. ------------------------------------------------ Its modified to work with current xlog format of Greenplum, which is different from Postgres code when this patch was committed. Main changes are to fit current backup block format in xlog records. Also, some masking routines differ compared to upstream as some of the masked flags would come once Greenplum catches up to latest versions of Postgres.
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