Re: [HACKERS] logical decoding of two-phase transactions

From: Nikhil Sontakke <nikhils(at)2ndquadrant(dot)com>
To: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>
Cc: Andres Freund <andres(at)anarazel(dot)de>, Robert Haas <robertmhaas(at)gmail(dot)com>, David Steele <david(at)pgmasters(dot)net>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Sokolov Yura <y(dot)sokolov(at)postgrespro(dot)ru>, Stas Kelvich <s(dot)kelvich(at)postgrespro(dot)ru>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] logical decoding of two-phase transactions
Date: 2018-11-29 14:40:34
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Hi Tomas,

> Any progress on the issues discussed in the last couple of messages?
> That is:
> 1) removing of the sleep() from tests

Done. Now the test_decoding plugin takes a new option "check-xid". We
will pass the XID which is going to be aborted via this option. The
test_decoding plugin will wait for this XID to abort and exit when
that happens. This removes any arbitrary sleep dependencies.

> 2) changes to systable_getnext() wrt. TransactionIdIsInProgress()


> 3) adding asserts / checks to codepaths not going through systable_*

Done. All the heap_* get api calls now assert that they are not being
invoked with a valid
CheckXidAlive value.

> 4) (not) adding this as a per-plugin option
> 5) handling cases where the downstream does not have 2PC enabled
struct OutputPluginOptions now has an enable_twophase field which will
be set by the plugin at init time similar to the way output_type is
set to binary/text now.

> I guess it'd be good an updated patch or further discussion before
> continuing the review efforts.

PFA, latest patchset which implements the above.

> regards
> --
> Tomas Vondra
> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Nikhil Sontakke
PostgreSQL Development, 24x7 Support, Training & Services

Attachment Content-Type Size
0001-Cleaning-up-of-flags-in-ReorderBufferTXN-structure.patch application/octet-stream 7.9 KB
0002-Support-decoding-of-two-phase-transactions-at-PREPAR.patch application/octet-stream 45.5 KB
0003-Gracefully-handle-concurrent-aborts-of-uncommitted-t.patch application/octet-stream 14.3 KB
0004-Teach-test_decoding-plugin-to-work-with-2PC.patch application/octet-stream 28.1 KB

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