On 05/07/2014 10:35 AM, Jeff Janes wrote:
When recovering from a crash (with injection of a partial page write at
time of crash) against 7c7b1f4ae5ea3b1b113682d4d I get a checksum
verification failure.
16396 is a gin index.
If I have it ignore checksum failures, there is no apparent misbehavior.
I'm trying to bisect it, but it could take a while and I thought someone
might have some theories based on the log:
29075 2014-05-06 23:29:51.411 PDT:LOG: 00000: database system was not
properly shut down; automatic recovery in progress
29075 2014-05-06 23:29:51.411 PDT:LOCATION: StartupXLOG, xlog.c:6361
29075 2014-05-06 23:29:51.412 PDT:LOG: 00000: redo starts at 11/323FE1C0
29075 2014-05-06 23:29:51.412 PDT:LOCATION: StartupXLOG, xlog.c:6600
29075 2014-05-06 23:29:51.471 PDT:WARNING: 01000: page verification
failed, calculated checksum 35967 but expected 7881
29075 2014-05-06 23:29:51.471 PDT:CONTEXT: xlog redo Delete list pages
A-ha. The WAL record of list page deletion doesn't create a full-page
images of the deleted pages. That's pretty sensible, as a deleted page
doesn't contain any data that needs to be retained. However, if a
full-page image is not taken, then the page should be completely
recreated from scratch at replay. It's not doing that.
Thanks for the testing! I'll have a stab at fixing that tomorrow.
Basically, ginRedoDeleteListPages() needs to re-initialize the deleted
pages.
- Heikki
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