[
https://issues.apache.org/jira/browse/BEAM-12044?focusedWorklogId=572755&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-572755
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ASF GitHub Bot logged work on BEAM-12044:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Mar/21 17:09
Start Date: 26/Mar/21 17:09
Worklog Time Spent: 10m
Work Description: turb opened a new pull request #14349:
URL: https://github.com/apache/beam/pull/14349
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.
Superseedes #14338
cc @jkff @aromanenko-dev
Post-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
<table>
<thead>
<tr>
<th>Lang</th>
<th>SDK</th>
<th>ULR</th>
<th>Dataflow</th>
<th>Flink</th>
<th>Samza</th>
<th>Spark</th>
<th>Twister2</th>
</tr>
</thead>
<tbody>
<tr>
<td>Go</td>
<td>
<a
href="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/";>
<img
src="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/badge/icon";>
</a>
</td>
<td>---</td>
<td>---</td>
<td>
<a
href="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/";>
<img alt="Build Status"
src="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/badge/icon";>
</a>
</td>
<td>---</td>
<td>
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</td>
<td>---</td>
</tr>
<tr>
<td>Java</td>
<td>
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</tr>
<tr>
<td>Python</td>
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</td>
<td>---</td>
<td>
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<td>---</td>
<td>
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</td>
<td>---</td>
</tr>
<tr>
<td>XLang</td>
<td>
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</td>
<td>---</td>
<td>
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</a>
</td>
<td>---</td>
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</a>
</td>
<td>---</td>
</tr>
</tbody>
</table>
Pre-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
<table>
<thead>
<tr>
<th>---</th>
<th>Java</th>
<th>Python</th>
<th>Go</th>
<th>Website</th>
<th>Whitespace</th>
<th>Typescript</th>
</tr>
</thead>
<tbody>
<tr>
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<td>Portable</td>
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<td>---</td>
<td>---</td>
<td>---</td>
<td>---</td>
</tr>
</tbody>
</table>
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Issue Time Tracking
-------------------
Worklog Id: (was: 572755)
Time Spent: 2.5h (was: 2h 20m)
> 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: 2.5h
> 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/[email protected]/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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