From: | Thomas Munro <munro(at)ip9(dot)org> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Craig Ringer <craig(at)2ndquadrant(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: SKIP LOCKED DATA (work in progress) |
Date: | 2014-08-31 00:36:28 |
Message-ID: | CADLWmXU9LXhxowjjzN5ZTQtiNxv7dWT3VjNzqiKYxJA5BEN72w@mail.gmail.com |
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On 28 August 2014 00:25, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
> Thomas Munro wrote:
>> I haven't yet figured out how to get get into a situation where
>> heap_lock_updated_tuple_rec waits.
>
> Well, as I think I said in the first post I mentioned this, maybe there
> is no such situation. In any case, like the EvalPlanQualFetch issue, we
> can fix it later if we find it.
I finally came up with a NOWAIT spec that reaches
heap_lock_updated_rec and then blocks. I can't explain why exactly...
but please see attached. The fix seems fairly straightforward. Do
you think I should submit an independent patch to fix this case (well
there are really two cases, since there is a separate multixact path)
for the existing NOWAIT support and then tackle the SKIP LOCKED
equivalent separately?
Best regards,
Thomas Munro
Attachment | Content-Type | Size |
---|---|---|
nowait-6.spec | text/x-rpm-spec | 635 bytes |
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