digoal
2023-04-07
PostgreSQL , PolarDB , postgres_fdw , parallel_abort , parallel_commit
PostgreSQL 16 preview - postgres_fdw foreign server option 支持 parallel_abort 选项, 并行回滚远端事务
此前postgres_fdw foreign server option 已支持 parallel_commit
+ALTER SERVER loopback2 OPTIONS (ADD parallel_abort 'true');
postgres_fdw: Add support for parallel abort.
author Etsuro Fujita <efujita@postgresql.org>
Thu, 6 Apr 2023 08:30:00 +0000 (17:30 +0900)
committer Etsuro Fujita <efujita@postgresql.org>
Thu, 6 Apr 2023 08:30:00 +0000 (17:30 +0900)
commit 983ec23007bd83a649af9bc823f13feb0da27e0e
tree d16c129d9a721b8ca9001390dc67bd58d072f451 tree
parent b9b125b9c14381c4d04a446e335bb2da5f602596 commit | diff
postgres_fdw: Add support for parallel abort.
postgres_fdw aborts remote (sub)transactions opened on remote server(s)
in a local (sub)transaction one by one when the local (sub)transaction
aborts. This patch allows it to abort the remote (sub)transactions in
parallel to improve performance. This is enabled by the server option
"parallel_abort". The default is false.
Etsuro Fujita, reviewed by David Zhang.
Discussion: http://postgr.es/m/CAPmGK15FuPVGx3TGHKShsbPKKtF1y58-ZLcKoxfN-nqLj1dZ%3Dg%40mail.gmail.com
524 <varlistentry>
525 <term><literal>parallel_commit</literal> (<type>boolean</type>)</term>
526 <listitem>
527 <para>
528 This option controls whether <filename>postgres_fdw</filename> commits
529 in parallel remote transactions opened on a foreign server in a local
530 transaction when the local transaction is committed. This setting also
531 applies to remote and local subtransactions. This option can only be
532 specified for foreign servers, not per-table. The default is
533 <literal>false</literal>.
534 </para>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry>
539 <term><literal>parallel_abort</literal> (<type>boolean</type>)</term>
540 <listitem>
541 <para>
542 This option controls whether <filename>postgres_fdw</filename> aborts
543 in parallel remote transactions opened on a foreign server in a local
544 transaction when the local transaction is aborted. This setting also
545 applies to remote and local subtransactions. This option can only be
546 specified for foreign servers, not per-table. The default is
547 <literal>false</literal>.
548 </para>
549 </listitem>
550 </varlistentry>
+ <para>
+ If multiple foreign servers with these options enabled are involved in a
+ local transaction, multiple remote transactions on those foreign servers
+ are committed or aborted in parallel across those foreign servers when
+ the local transaction is committed or aborted.
+ </para>
