On Fri, Jun 3, 2016 at 11:13 PM, Robert Haas <robertmh...@gmail.com> 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).
> This is very likely a good idea, but...
>> 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.
> ...I think we should do this too

Patches for both of these things are now committed.  Barring problems
with those commits, I believe this resolves this open item.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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