| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Melanie Plageman <melanieplageman(at)gmail(dot)com> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Assertion failure with barriers in parallel hash join |
| Date: | 2020-10-12 23:18:11 |
| Message-ID: | CA+hUKGK3Vr_w0fyrvVj0-kCfJ_bEsXzrZsgG4Bxre+nFApQ3bA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Oct 13, 2020 at 12:15 PM Melanie Plageman
<melanieplageman(at)gmail(dot)com> wrote:
> On Thu, Oct 1, 2020 at 8:08 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
>> On Tue, Sep 29, 2020 at 9:12 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
>> Here's a throw-away patch to add some sleeps that trigger the problem,
>> and a first draft fix. I'll do some more testing of this next week
>> and see if I can simplify it.
>
> I was just taking a look at the patch and noticed the commit message
> says:
>
> > With unlucky timing and parallel_leader_participation off...
>
> Is parallel_leader_participation being off required to reproduce the
> issue?
Yeah, because otherwise the leader detaches last so the problem doesn't arise.
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