| From: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
|---|---|
| To: | Nikhil Sontakke <nikhils(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Craig Ringer <craig(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>, Andres Freund <andres(at)anarazel(dot)de>, 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 Hackers <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Subject: | Re: [HACKERS] logical decoding of two-phase transactions |
| Date: | 2017-12-19 19:52:00 |
| Message-ID: | dec39ab4-cc36-e01c-7a00-0087fe8644da@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 12/19/17 03:37, Nikhil Sontakke wrote:
> Note that this patch does not contain the HeapTupleSatisfiesVacuum
> changes. I believe we need changes to HeapTupleSatisfiesVacuum given
> than logical decoding changes the assumption that catalog tuples
> belonging to a transaction which never committed can be reclaimed
> immediately. With 2PC logical decoding or streaming logical decoding,
> we can always have a split time window in which the ongoing decode
> cycle needs those tuples. The solution is that even for aborted
> transactions, we do not return HEAPTUPLE_DEAD if the transaction id is
> newer than the OldestXmin (same logic we use for deleted tuples of
> committed transactions). We can do this only for catalog table rows
> (both system and user defined) to limit the scope of impact. In any
> case, this needs to be a separate patch along with a separate
> discussion thread.
Are you working on that as well?
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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