作者
digoal
日期
2021-01-01
标签
PostgreSQL , 2pc , 逻辑复制
背景
PostgreSQL 14 扩展内置逻辑复制output plugin api, 支持2pc事务. 新增6个callback函数.
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=0aa8a01d04c8fe200b7a106878eebc3d0af9105c
```
Extend the output plugin API to allow decoding of prepared xacts.
This adds six methods to the output plugin API, adding support for
streaming changes of two-phase transactions at prepare time.
- begin_prepare
- filter_prepare
- prepare
- commit_prepared
- rollback_prepared
- stream_prepare
Most of this is a simple extension of the existing methods, with the
semantic difference that the transaction is not yet committed and maybe
aborted later.
Until now two-phase transactions were translated into regular transactions
on the subscriber, and the GID was not forwarded to it. None of the
two-phase commands were communicated to the subscriber.
This patch provides the infrastructure for logical decoding plugins to be
informed of two-phase commands Like PREPARE TRANSACTION, COMMIT PREPARED
and ROLLBACK PREPARED commands with the corresponding GID.
This also extends the 'test_decoding' plugin, implementing these new
methods.
This commit simply adds these new APIs and the upcoming patch to "allow
the decoding at prepare time in ReorderBuffer" will use these APIs.
Author: Ajin Cherian and Amit Kapila based on previous work by Nikhil Sontakke and Stas Kelvich
Reviewed-by: Amit Kapila, Peter Smith, Sawada Masahiko, and Dilip Kumar
Discussion:
https://postgr.es/m/02DA5F5E-CECE-4D9C-8B4B-418077E2C010@postgrespro.ru
https://postgr.es/m/CAMGcDxeqEpWj3fTXwqhSwBdXd2RS9jzwWscO-XbeCfso6ts3+Q@mail.gmail.com
```
https://www.postgresql.org/docs/devel/logicaldecoding-output-plugin.html
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