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https://issues.apache.org/jira/browse/BEAM-12044?focusedWorklogId=572739&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-572739
]
ASF GitHub Bot logged work on BEAM-12044:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Mar/21 16:41
Start Date: 26/Mar/21 16:41
Worklog Time Spent: 10m
Work Description: turb commented on a change in pull request #14338:
URL: https://github.com/apache/beam/pull/14338#discussion_r602440411
##########
File path:
sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/JdbcIO.java
##########
@@ -903,6 +903,8 @@ public void processElement(ProcessContext context) throws
Exception {
if (connection == null) {
connection = dataSource.getConnection();
}
+ // PostgreSQL requires autocommit to be disabled to enable cursor
streaming
Review comment:
If I have an idea on how the parameter can be specified, it will be
additional work yes, but I can spend some reasonable time on it.
However, I am inclined to invoke YAGNI principle: once this parameter is
needed (and I can't determine how someone would need autocommit while reading),
the way to parameterize it and to take it into account in `JdbcIO` will appear
more clearly.
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Issue Time Tracking
-------------------
Worklog Id: (was: 572739)
Time Spent: 2h 10m (was: 2h)
> 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: 2h 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/[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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