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Re: increasing the default WAL segment size

Stephen Frost <sfrost@snowman.net>

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From: Stephen Frost <sfrost@snowman.net>
To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>, David Steele <david@pgmasters.net>, Beena Emerson <memissemerson@gmail.com>, tushar <tushar.ahuja@enterprisedb.com>, Prabhat Sahu <prabhat.sahu@enterprisedb.com>, Ashutosh Sharma <ashu.coek88@gmail.com>, Jim Nasby <Jim.Nasby@bluetreble.com>, Kuntal Ghosh <kuntalghosh.2007@gmail.com>, Andres Freund <andres@anarazel.de>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2017-03-22T14:41:27Z
Lists: pgsql-hackers 
Peter,

* Peter Eisentraut (peter.eisentraut@2ndquadrant.com) wrote:
> On 3/22/17 08:46, Stephen Frost wrote:
> > It's not my intent to 'torpedo' this patch but I'm pretty disappointed
> > that we're introducing yet another initdb-time option with, as far as I
> > can tell, no option to change it after the cluster has started (without
> > some serious hackery), and continuing to have a poor default, which is
> > what most users will end up with.
> 
> I understand this concern, but what alternative do you have in mind?

Changing the default to a more reasonable value would at least reduce
the issue.

I think it'd also be nice to have a way to change it post-initdb, but
that's less of an issue if we are at least setting it to a good default
to begin with instead of a minimal one.

Thanks!

Stephen

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.