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Posted to issues@beam.apache.org by "Sylvain Veyrié (Jira)" <ji...@apache.org> on 2021/03/24 09:42:00 UTC
[jira] [Created] (BEAM-12044) JdbcIO should explicitly
setAutoCommit to false
Sylvain Veyrié created BEAM-12044:
-------------------------------------
Summary: 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
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, 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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