Horton

Re: Pipeline mode and PQpipelineSync()

Alvaro Herrera <alvaro.herrera@2ndquadrant.com>

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From: Alvaro Herrera <alvaro.herrera@2ndquadrant.com>
To: Boris Kolpackov <boris@codesynthesis.com>
Cc: pgsql-hackers@lists.postgresql.org
Date: 2021-06-29T15:03:57Z
Lists: pgsql-hackers 
On 2021-Jun-29, Boris Kolpackov wrote:

> Alvaro Herrera <alvaro.herrera@2ndquadrant.com> writes:
> 
> > No luck reproducing any problems with this sequence as yet.
> 
> Can you try to recreate the call flow as implemented here (it's
> pretty much plain old C if you ignore error handling):

> https://git.codesynthesis.com/cgit/odb/libodb-pgsql/tree/odb/pgsql/statement.cxx?h=bulk#n789

Hmm, I can't see what's different there than what I get on my test
program.  Can you please do PQtrace() on the connection and send the
resulting trace file?  Maybe I can compare the traffic to understand
what's the difference.

(I do see that you're doing PQisBusy that I'm not.  Going to try adding
it next.)

Thanks

-- 
Álvaro Herrera                            39°49'30"S 73°17'W

Commits

  1. libpq: Fix sending queries in pipeline aborted state

  2. Fix libpq state machine in pipeline mode

  3. Add PQsendFlushRequest to libpq