From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Jeff Davis <pgsql(at)j-davis(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Enabling Checksums |
Date: | 2012-12-05 23:49:42 |
Message-ID: | CA+U5nM+HEJkgOA2PgmDpYg0-UYxafvvgbV8hbg=MxBZ8pS3TZQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On 5 December 2012 23:40, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Tue, Dec 4, 2012 at 6:17 PM, Jeff Davis <pgsql(at)j-davis(dot)com> wrote:
>> Or, I could write up a test framework in ruby or python, using the
>> appropriate pg driver, and some not-so-portable shell commands to start
>> and stop the server. Then, I can publish that on this list, and that
>> would at least make it easier to test semi-manually and give greater
>> confidence in pre-commit revisions.
>
> That latter approach is similar to what happened with SSI's isolation
> tester. It started out in Python, and then Heikki rewrote it in C.
> If Python/Ruby code is massively simpler to write than the C code,
> that might be a good way to start out. It'll be an aid to reviewers
> even if neither it nor any descendent gets committed.
>
> Frankly, I think some automated testing harness (written in C or Perl)
> that could do fault-injection tests as part of the buildfarm would be
> amazingly awesome. I'm drooling just thinking about it. But I guess
> that's getting ahead of myself.
Agreed, though we can restrict that to a few things at first.
* Zeroing pages, making pages all 1s
* Transposing pages
* Moving chunks of data sideways in a block
* Flipping bits randomly
* Flipping data endianness
* Destroying particular catalog tables or structures
etc
As a contrib module, so we can be sure to never install it. ;-)
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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