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Re: increasing the default WAL segment size

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2016-09-20T20:42:01Z
Lists: pgsql-hackers 
On 2016-09-20 16:32:46 -0400, Robert Haas wrote:
> > Requiring a non-default compile time or even just cluster creation time
> > option for tuning isn't something worth expanding energy on imo.
> 
> I don't agree.  The latency requirements on an archive_command when
> you're churning out 16MB files multiple times per second are insanely
> tight, and saying that we shouldn't increase the size because it's
> better to go redesign a bunch of other things that will eventually
> *maybe* remove the need for archive_command does not seem like a
> reasonable response.

Oh, I'm on board with increasing the default size a bit. A different
default size isn't a non-default compile time option anymore though, and
I don't think 1GB is a reasonable default.

Running multiple archive_commands concurrently - pretty easy to
implement - isn't the same as removing the need for archive command. I'm
pretty sure that continously,and if necessary concurrently, archiving a
bunch of 64MB files is going to work better than irregularly
creating / transferring 1GB files.


Andres

Commits

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

  1. Make WAL segment size configurable at initdb time.

  2. Perform only one ReadControlFile() during startup.

  3. Introduce BYTES unit for GUCs.

  4. Remove useless duplicate inclusions of system header files.

  5. Refactor other replication commands to use DestRemoteSimple.

  6. Add a SHOW command to the replication command language.

  7. Add a new DestReceiver for printing tuples without catalog access.

  8. Support fls().

  9. Extend yesterday's patch making BLCKSZ and RELSEG_SIZE configurable to also

  10. Commit the reasonably uncontroversial parts of J.R. Nield's PITR patch, to

  11. XLOG (also known as WAL -:)) Bootstrap/Startup/Shutdown.

  12. Transaction log manager core code.