Horton

Re: hung backends stuck in spinlock heavy endless loop

Peter Geoghegan <pg@heroku.com>

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From: Peter Geoghegan <pg@heroku.com>
To: Merlin Moncure <mmoncure@gmail.com>
Cc: Andres Freund <andres@2ndquadrant.com>, Tom Lane <tgl@sss.pgh.pa.us>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2015-01-15T04:50:05Z
Lists: pgsql-hackers 
On Wed, Jan 14, 2015 at 5:23 PM, Peter Geoghegan <pg@heroku.com> wrote:
> My immediate observation here is that blocks 2 and 9 have identical
> metadata (from their page opaque area), but partially non-matching
> data items (however, the number of items on each block is consistent
> and correct according to that metadata, as far as it goes). I think
> block 9 is supposed to have a right-link to block 5 (block 5 seems to
> think so, at least -- its left link is 9).

I am mistaken on one detail here - blocks 2 and 9 are actually fully
identical. I still have no idea why, though.
-- 
Peter Geoghegan

Commits

  1. Improve hash_create's API for selecting simple-binary-key hash functions.

  2. Fix WAL-logging of B-tree "unlink halfdead page" operation.

  3. Fix backup-block numbering in redo of b-tree split.

  4. Cleanup of new b-tree page deletion code.

  5. Fix bug in the new B-tree incomplete-split code.

  6. Fix bug in new B-tree page deletion code.

  7. Fix rm_desc routine of b-tree page delete records.

  8. Make the handling of interrupted B-tree page splits more robust.

  9. Fix race condition in B-tree page deletion.