Re: WIP: Avoid creation of the free space map for small tables

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: John Naylor <john(dot)naylor(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Peter Geoghegan <pg(at)bowt(dot)ie>
Subject: Re: WIP: Avoid creation of the free space map for small tables
Date: 2019-02-22 16:04:06
Message-ID: 20190222160406.GA7298@alvherre.pgsql
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On 2019-Feb-22, Amit Kapila wrote:

> On Fri, Feb 22, 2019 at 1:57 AM Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
> >
> > I think this test is going to break on nonstandard block sizes. While
> > we don't promise that all tests work on such installs (particularly
> > planner ones),
>
> The reason for not pushing much on making the test pass for
> nonstandard block sizes is that when I tried existing tests, there
> were already some failures. For example, see the failures in the
> attached regression diff files (for block_size as 16K and 32K
> respectively). I saw those failures during the previous
> investigation, the situation on HEAD might or might not be exactly the
> same. Whereas I see the value in trying to make sure that tests pass
> for nonstandard block sizes, but that doesn't seem to be followed for
> all the tests.

Wow, there's a lot less tests failing there than I thought there would
be. That increases hope that we can someday have them pass. +1 on not
making things worse.

I think the crash in the amcheck test should be studied, one way or
another; CCing Peter.

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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