Horton

Re: new heapcheck contrib module

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: Mark Dilger <mark.dilger@enterprisedb.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2020-04-20T20:03:33Z
Lists: pgsql-hackers 
[ retrying from the email address I intended to use ]

On Mon, Apr 20, 2020 at 3:42 PM Andres Freund <andres@anarazel.de> wrote:
> I don't think random interspersed uses of CLogTruncationLock are a good
> idea. If you move to only checking visibility after tuple fits into
> [relfrozenxid, nextXid), then you don't need to take any locks here, as
> long as a lock against vacuum is taken (which I think this should do
> anyway).

I think it would be *really* good to avoid ShareUpdateExclusiveLock
here. Running with only AccessShareLock would be a big advantage. I
agree that any use of CLogTruncationLock should not be "random", but I
don't see why the same method we use to make txid_status() safe to
expose to SQL shouldn't also be used here.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Commits

  1. Add pg_amcheck, a CLI for contrib/amcheck.

  2. Refactor and generalize the ParallelSlot machinery.

  3. Generalize parallel slot result handling.

  4. Move some code from src/bin/scripts to src/fe_utils to permit reuse.

  5. Factor pattern-construction logic out of processSQLNamePattern.

  6. Doc: clean up verify_heapam() documentation.

  7. Fix more portability issues in new amcheck code.

  8. Fix portability issues in new amcheck test.

  9. Try to avoid a compiler warning about using fxid uninitialized.

  10. Extend amcheck to check heap pages.

  11. Adjust walsender usage of xlogreader, simplify APIs

  12. Improve checking of child pages in contrib/amcheck.

  13. Sanitize line pointers within contrib/amcheck.

  14. Fix possible sorting error when aborting use of abbreviated keys.