Re: Speedup twophase transactions

From: Nikhil Sontakke <nikhils(at)2ndquadrant(dot)com>
To: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
Cc: David Steele <david(at)pgmasters(dot)net>, Stas Kelvich <s(dot)kelvich(at)postgrespro(dot)ru>, Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>
Subject: Re: Speedup twophase transactions
Date: 2017-03-28 05:31:55
Message-ID: CAMGcDxfTQkc82YLGcOjCwc=FF35zSZMLNrVqvjmeVgegpOTLDQ@mail.gmail.com
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Please ignore reports about errors in other tests. Seem spurious..

Regards,
Nikhils

On 28 March 2017 at 10:40, Nikhil Sontakke <nikhils(at)2ndquadrant(dot)com> wrote:

> Hi Micheal,
>
> The latest patch looks good. By now doing a single scan of shmem two phase
> data, we have removed the double loops in all the affected functions which
> is good.
>
> My only question is if the added call to restoreTwoPhaseData() is good
> enough to handle all the 3 functions PrescanPreparedTransactions(),
> StandbyRecoverPreparedTransactions() and RecoverPreparedTransactions()
> appropriately? It looks as if it does, but we need to be doubly sure..
>
> PFA, revised patch with a very minor typo fix and rebase against latest
> master. The test cases pass as needed.
>
> Oh, btw, while running TAP tests, I got a few errors in unrelated tests.
>
> "# testing connection parameter "target_session_attrs"
>
> not ok 5 - connect to node master if mode "read-write" and
> master,standby_1 listed
>
>
> # Failed test 'connect to node master if mode "read-write" and
> master,standby_1 listed'
>
> # at t/001_stream_rep.pl line 93.
>
> # got: ''
>
> # expected: '1'
>
> not ok 6 - connect to node master if mode "read-write" and
> standby_1,master listed
>
>
> # Failed test 'connect to node master if mode "read-write" and
> standby_1,master listed'
>
> # at t/001_stream_rep.pl line 93.
>
> # got: ''
>
> # expected: '1'
>
> not ok 7 - connect to node master if mode "any" and master,standby_1 listed
>
>
> # Failed test 'connect to node master if mode "any" and master,standby_1
> listed'
>
> # at t/001_stream_rep.pl line 93.
>
> # got: ''
>
> # expected: '1'
>
> not ok 8 - connect to node standby_1 if mode "any" and standby_1,master
> listed"
>
> Again, not related to this recovery code path, but not sure if others see
> this as well.
>
> Regards,
> Nikhils
>
> On 27 March 2017 at 05:35, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
> wrote:
>
>> On Sun, Mar 26, 2017 at 4:50 PM, Nikhil Sontakke
>> <nikhils(at)2ndquadrant(dot)com> wrote:
>> > I was away for a bit. I will take a look at this patch and get back to
>> you
>> > soon.
>>
>> No problem. Thanks for your time!
>> --
>> Michael
>>
>
>
>
> --
> Nikhil Sontakke http://www.2ndQuadrant.com/
> PostgreSQL/Postgres-XL Development, 24x7 Support, Training & Services
>

--
Nikhil Sontakke http://www.2ndQuadrant.com/
PostgreSQL/Postgres-XL Development, 24x7 Support, Training & Services

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