Horton

Re: hung backends stuck in spinlock heavy endless loop

Peter Geoghegan <pg@heroku.com>

View thread View on postgr.es
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: 2015-01-14T20:32:54Z
Lists: pgsql-hackers 
On Wed, Jan 14, 2015 at 12:24 PM, Peter Geoghegan <pg@heroku.com> wrote:
> Could you write some code to print out the block number (i.e.
> "BlockNumber blkno") if there are more than, say, 5 retries within
> _bt_moveright()?

Obviously I mean that the block number should be printed, no matter
whether or not the P_INCOMPLETE_SPLIT() path is taken or not. So you
should just move this to the top of the for(;;) loop, so it's always
available to print:

BlockNumber blkno = BufferGetBlockNumber(buf);

Thanks
-- 
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.