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Re: WIP: WAL prefetch (another approach)

Greg Stark <stark@mit.edu>

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From: Greg Stark <stark@mit.edu>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thomas Munro <thomas.munro@gmail.com>, Tomas Vondra <tomas.vondra@enterprisedb.com>, Daniel Gustafsson <daniel@yesql.se>, Stephen Frost <sfrost@snowman.net>, Alvaro Herrera <alvherre@2ndquadrant.com>, Andres Freund <andres@anarazel.de>, David Steele <david@pgmasters.net>, Dmitry Dolgov <9erthalion6@gmail.com>, Jakub Wartak <Jakub.Wartak@tomtom.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2021-12-17T23:55:50Z
Lists: pgsql-hackers 
On Fri, 17 Dec 2021 at 18:40, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Greg Stark <stark@mit.edu> writes:
> > Hm. I seem to have picked a bad checkout. I took the last one before
> > the revert (45aa88fe1d4028ea50ba7d26d390223b6ef78acc).
>
> FWIW, I think that's the first one *after* the revert.

Doh

But the bigger question is. Are we really concerned about this flaky
problem? Is it worth investing time and money on? I can get money to
go buy a G4 or G5 and spend some time on it. It just seems a bit...
niche. But if it's a real bug that represents something broken on
other architectures that just happens to be easier to trigger here it
might be worthwhile.

-- 
greg

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Fix recovery_prefetch docs.

  2. Prefetch data referenced by the WAL, take II.

  3. Add circular WAL decoding buffer, take II.

  4. Fix generation of ./INSTALL for the distribution tarball

  5. Revert recovery prefetching feature.

  6. Sync guc.c and postgresql.conf.sample with the SGML docs.

  7. Add information of total data processed to replication slot stats.

  8. Doc: Review for "Optionally prefetch referenced data in recovery."

  9. Add circular WAL decoding buffer.

  10. Optionally prefetch referenced data in recovery.

  11. Remove read_page callback from XLogReader.

  12. Provide ReadRecentBuffer() to re-pin buffers by ID.

  13. Provide recovery_init_sync_method=syncfs.

  14. Mark factorial operator, and postfix operators in general, as deprecated.

  15. Rationalize GetWalRcv{Write,Flush}RecPtr().

  16. Support PrefetchBuffer() in recovery.

  17. Prevent hard failures of standbys caused by recycled WAL segments