On Thu, May 26, 2016 at 03:27:40PM +0530, Amit Kapila wrote:
> I think the workers should stop processing tuples after the tuple queues
> got detached. This will not only handle above situation gracefully, but
> will allow to speed up the queries where Limit clause is present on top of
> Gather node. Patch for the same is attached with mail (this was part of
> original parallel seq scan patch, but was not applied and the reason as far
> as I remember was we thought such an optimization might not be required for
> initial version).
> Another approach to fix this issue could be to reset mqh_partial_bytes and
> mqh_length_word_complete in shm_mq_sendv in case of SHM_MQ_DETACHED.
> These are currently reset only incase of success.
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The above-described topic is currently a PostgreSQL 9.6 open item. Robert,
since you committed the patch believed to have created it, you own this open
item. If some other commit is more relevant or if this does not belong as a
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efforts toward speedy resolution. Thanks.
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