From: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
---|---|
To: | Ian Barwick <ian(dot)barwick(at)2ndquadrant(dot)com>, Pavel Borisov <pashkin(dot)elfe(at)gmail(dot)com>, Anastasia Lubennikova <a(dot)lubennikova(at)postgrespro(dot)ru> |
Cc: | Ian Lawrence Barwick <barwick(at)gmail(dot)com>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Corner-case bug in pg_rewind |
Date: | 2020-12-03 22:16:51 |
Message-ID: | b0a3b95b-82d2-6089-6892-40570f8c5e60@iki.fi |
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Lists: | pgsql-hackers |
On 03/12/2020 16:10, Heikki Linnakangas wrote:
> On 02/12/2020 15:26, Ian Barwick wrote:
>> On 02/12/2020 20:13, Heikki Linnakangas wrote:
>>> Attached are two patches. The first patch is your original patch, unmodified
>>> (except for a cosmetic rename of the test file). The second patch builds on
>>> that, demonstrating and fixing the issue I mentioned. It took me a while to
>>> create a repro for it, it's easily masked by incidental full-page writes or
>>> because rows created by XIDs that are not marked as committed on the other
>>> timeline are invisible, but succeeded at last.
>>
>> Aha, many thanks. I wasn't entirely sure what I was looking for there and
>> recently haven't had the time or energy to dig any further.
>
> Ok, pushed and backpatched this now.
The buildfarm is reporting sporadic failures in the new regression test.
I suspect it's because of timing issues, where a server is promoted or
shut down before some data has been replicated. I'll fix that tomorrow
morning.
- Heikki
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