| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: intermittent failures in Cygwin from select_parallel tests |
| Date: | 2017-06-15 21:16:03 |
| Message-ID: | 10063.1497561363@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Thu, Jun 15, 2017 at 5:06 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> ... nodeGather cannot deem the query done until it's seen EOF on
>> each tuple queue, which it cannot see until each worker has attached
>> to and then detached from the associated shm_mq.
> Oh. That's sad. It definitely has to wait for any tuple queues that
> have been attached to be detached, but it would be better if it didn't
> have to wait for processes that haven't even attached yet.
Hm. We assume they attach before they start taking any of the query
work? Seems reasonable, and this would give us some chance of recovering
from worker fork failure.
regards, tom lane
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