作者
digoal
日期
2020-10-10
标签
PostgreSQL , postgres_fdw
背景
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=32a9c0bdf493cf5fc029ab44a22384d547290eff
```
postgres_fdw: reestablish new connection if cached one is detected as broken.
author Fujii Masao fujii@postgresql.org
Tue, 6 Oct 2020 09:31:09 +0800 (10:31 +0900)
committer Fujii Masao fujii@postgresql.org
Tue, 6 Oct 2020 09:51:07 +0800 (10:51 +0900)
commit 32a9c0bdf493cf5fc029ab44a22384d547290eff
tree 2d3984e535f8226c48122eacbe369150557e682b tree | snapshot
parent dd0a64ed435d4a266ed16adb8204e7222af6c164 commit | diff
postgres_fdw: reestablish new connection if cached one is detected as broken.
In postgres_fdw, once remote connections are established, they are cached
and re-used for subsequent queries and transactions. There can be some
cases where those cached connections are unavaiable, for example,
by the restart of remote server. In these cases, previously an error was
reported and the query accessing to remote server failed if new remote
transaction failed to start because the cached connection was broken.
This commit improves postgres_fdw so that new connection is remade
if broken connection is detected when starting new remote transaction.
This is useful to avoid unnecessary failure of queries when connection is
broken but can be reestablished.
Author: Bharath Rupireddy, tweaked a bit by Fujii Masao
Reviewed-by: Ashutosh Bapat, Tatsuhito Kasahara, Fujii Masao
Discussion: https://postgr.es/m/CALj2ACUAi23vf1WiHNar_LksM9EDOWXcbHCo-fD4Mbr1d=78YQ@mail.gmail.com
```
当postgres_fdw的远程数据库链接丢失:
- 如果是新建事务, 自动新建链接.
- 如果是老事务, 依旧保持失败, 确保原子性.
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