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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: 2021-12-17T22:56:22Z
Lists: pgsql-hackers 
Hm. I seem to have picked a bad checkout. I took the last one before
the revert (45aa88fe1d4028ea50ba7d26d390223b6ef78acc). Or there's some
incompatibility with the emulation and the IPC stuff parallel workers
use.


2021-12-17 17:51:51.688 EST [50955] LOG:  background worker "parallel
worker" (PID 54073) was terminated by signal 10: Bus error
2021-12-17 17:51:51.688 EST [50955] DETAIL:  Failed process was
running: SELECT variance(unique1::int4), sum(unique1::int8),
regr_count(unique1::float8, unique1::float8)
FROM (SELECT * FROM tenk1
      UNION ALL SELECT * FROM tenk1
      UNION ALL SELECT * FROM tenk1
      UNION ALL SELECT * FROM tenk1) u;
2021-12-17 17:51:51.690 EST [50955] LOG:  terminating any other active
server processes
2021-12-17 17:51:51.748 EST [54078] FATAL:  the database system is in
recovery mode
2021-12-17 17:51:51.761 EST [50955] LOG:  all server processes
terminated; reinitializing

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