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Date: Thu, 26 Oct 2017 22:01:40 +0300
From: Sokolov Yura <y.sokolov@postgrespro.ru>
To: Stas Kelvich <s.kelvich@postgrespro.ru>
Cc: Nikhil Sontakke <nikhils@2ndquadrant.com>, Andres Freund
 <andres@anarazel.de>, Dmitry Dolgov <9erthalion6@gmail.com>, Tom Lane
 <tgl@sss.pgh.pa.us>, Masahiko Sawada <sawada.mshk@gmail.com>, Simon Riggs
 <simon@2ndquadrant.com>, Craig Ringer <craig@2ndquadrant.com>, Petr Jelinek
 <petr.jelinek@2ndquadrant.com>, PostgreSQL Hackers
 <pgsql-hackers@postgresql.org>, Robert Haas <robertmhaas@gmail.com>
Subject: Re: logical decoding of two-phase transactions
Organization: Postgres Professional
In-Reply-To: <D6F3575D-BA17-43AB-A75F-12934885BADB@postgrespro.ru>
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On 2017-09-27 14:46, Stas Kelvich wrote:
>> On 7 Sep 2017, at 18:58, Nikhil Sontakke <nikhils@2ndquadrant.com> 
>> wrote:
>> 
>> Hi,
>> 
>> FYI all, wanted to mention that I am working on an updated version of
>> the latest patch that I plan to submit to a later CF.
>> 
> 
> Cool!
> 
> So what kind of architecture do you have in mind? Same way as is it
> was implemented before?
> As far as I remember there were two main issues:
> 
> * Decodong of aborted prepared transaction.
> 
> If such transaction modified catalog then we can’t read reliable info
> with our historic snapshot,
> since clog already have aborted bit for our tx it will brake
> visibility logic. There are some way to
> deal with that — by doing catalog seq scan two times and counting
> number of tuples (details
> upthread) or by hijacking clog values in historic visibility function.
> But ISTM it is better not solve this
> issue at all =) In most cases intended usage of decoding of 2PC
> transaction is to do some form
> of distributed commit, so naturally decoding will happens only with
> in-progress transactions and
> we commit/abort will happen only after it is decoded, sent and
> response is received. So we can
> just have atomic flag that prevents commit/abort of tx currently being
> decoded. And we can filter
> interesting prepared transactions based on GID, to prevent holding
> this lock for ordinary 2pc.
> 
> * Possible deadlocks that Andres was talking about.
> 
> I spend some time trying to find that, but didn’t find any. If locking
> pg_class in prepared tx is the only
> example then (imho) it is better to just forbid to prepare such
> transactions. Otherwise if some realistic
> examples that can block decoding are actually exist, then we probably
> need to reconsider the way
> tx being decoded. Anyway this part probably need Andres blessing.

Just rebased patch logical_twophase_v6 to master.

Fixed small issues:
- XactLogAbortRecord wrote DBINFO twice, but it was decoded in
   ParseAbortRecord only once. Second DBINFO were parsed as ORIGIN.
   Fixed by removing second write of DBINFO.
- SnapBuildPrepareTxnFinish tried to remove xid from `running` instead
   of `committed`. And it removed only xid, without subxids.
- test_decoding skipped returning "COMMIT PREPARED" and "ABORT 
PREPARED",

Big issue were with decoding ddl-including two-phase transactions:
- prepared.out were misleading. We could not reproduce decoding body of
   "test_prepared#3" with logical_twophase_v6.diff. It was skipped if
   `pg_logical_slot_get_changes` were called without
   `twophase-decode-with-catalog-changes` set, and only "COMMIT PREPARED
   test_prepared#3" were decoded.
The reason is "PREPARE TRANSACTION" is passed to `pg_filter_prepare`
twice:
- first on "PREPARE" itself,
- second - on "COMMIT PREPARED".
In v6, `pg_filter_prepare` without `with-catalog-changes` first time
answered "true" (ie it should not be decoded), and second time (when
transaction became committed) it answered "false" (ie it should be
decoded). But second time in DecodePrepare 
`ctx->snapshot_builder->start_decoding_at`
is already in a future compared to `buf->origptr` (because it is
on "COMMIT PREPARED" lsn). Therefore DecodePrepare just called
ReorderBufferForget.
If `pg_filter_prepare` is called with `with-catalog-changes`, then
it returns "false" both times, thus DeocdePrepare decodes transaction
in first time, and calls `ReorderBufferForget` in second time.

I didn't found a way to fix it gracefully. I just change 
`pg_filter_prepare`
to return same answer both times: "false" if called 
`with-catalog-changes`
(ie need to call DecodePrepare), and "true" otherwise. With this
change, catalog changing two-phase transaction is decoded as simple
one-phase transaction, if `pg_logical_slot_get_changes` is called
without `with-catalog-changes`.

-- 
With regards,
Sokolov Yura
Postgres Professional: https://postgrespro.ru
The Russian Postgres Company
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