Horton
Menu

Re: WIP: WAL prefetch (another approach)

Tomas Vondra <tomas.vondra@enterprisedb.com>

View thread
From: Tomas Vondra <tomas.vondra@enterprisedb.com>
To: Greg Stark <stark@mit.edu>, Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thomas Munro <thomas.munro@gmail.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: 2021-12-17T23:04:00Z
Lists: pgsql-hackers 
On 12/17/21 23:56, Greg Stark wrote:
> 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
> 

Interesting. In my experience SIGBUS on PPC tends to be due to incorrect 
alignment, but I'm not sure how that works with the emulation. Can you 
get a backtrace?

regards

-- 
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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