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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/03/25 09:33:00 UTC
[jira] [Work logged] (BEAM-12044) JdbcIO should explicitly
setAutoCommit to false
[ https://issues.apache.org/jira/browse/BEAM-12044?focusedWorklogId=571757&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-571757 ]
ASF GitHub Bot logged work on BEAM-12044:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 25/Mar/21 09:32
Start Date: 25/Mar/21 09:32
Worklog Time Spent: 10m
Work Description: turb opened a new pull request #14338:
URL: https://github.com/apache/beam/pull/14338
According to [PostgreSQL JDBC documentation](https://jdbc.postgresql.org/documentation/head/query.html#query-with-cursor), it is required to disable autocommit in order to allow cursor streaming.
In `JdbcIO:1548` we have `poolableConnectionFactory.setDefaultAutoCommit(false);`, however it is only applicable to poolable datasource. So any other usage will eventually lead to OOM since the JDBC driver silently falls back to full memoization of the request result.
The commit disables autocommit more systematically.
cc @lukecwik @kennknowles @aaltay
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Issue Time Tracking
-------------------
Worklog Id: (was: 571757)
Remaining Estimate: 0h
Time Spent: 10m
> JdbcIO should explicitly setAutoCommit to false
> -----------------------------------------------
>
> Key: BEAM-12044
> URL: https://issues.apache.org/jira/browse/BEAM-12044
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Affects Versions: 2.28.0
> Reporter: Sylvain Veyrié
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Hello,
> Per [PostgreSQL JDBC documentation|https://jdbc.postgresql.org/documentation/head/query.html#query-with-cursor], autocommit must be explicitly disabled on the connection to allow cursor streaming.
> [~jkff] mentionned it [on the mailing list|https://www.mail-archive.com/dev@beam.apache.org/msg16808.html], however even if there is:
> {code:java}
> poolableConnectionFactory.setDefaultAutoCommit(false);
> {code}
> in JdbcIO:1555, currently, at least with JDBC driver 42.2.16, any read with JdbcIO will memoize the whole dataset (which leads to OOM), since
> {code:java}
> connection.getAutoCommit()
> {code}
> returns true in JdbcIO#ReadFn#processElement.
> I can provide a PR — the patch is pretty simple (and solves the problem for us in 2.28.0):
> {code:java}
> if (connection == null) {
> connection = dataSource.getConnection();
> }
> connection.setAutoCommit(false); // line added
> {code}
> Thanks!
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