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Posted to issues@drill.apache.org by "Vova Vysotskyi (Jira)" <ji...@apache.org> on 2020/01/29 17:14:00 UTC
[jira] [Updated] (DRILL-7459) Fetch size does not work on Postgres
JDBC plugin
[ https://issues.apache.org/jira/browse/DRILL-7459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vova Vysotskyi updated DRILL-7459:
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Labels: ready-to-commit (was: )
> Fetch size does not work on Postgres JDBC plugin
> ------------------------------------------------
>
> Key: DRILL-7459
> URL: https://issues.apache.org/jira/browse/DRILL-7459
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - JDBC
> Affects Versions: 1.15.0
> Reporter: Priyanka Bhoir
> Priority: Major
> Labels: ready-to-commit
>
> To prevent the drill from going out of memory, it is suggested to set the fetch size in Jdbc URL to enable data streaming([#DRILL-6794 | https://issues.apache.org/jira/browse/DRILL-6794] discusses this). This does not work on Postgres for the following reason:
> For fetchSize size to work on Postgres, the connection must not be in autocommit mode. There is no parameter to set autocommit to false in connection string other than programmatically calling conn.setAutoCommit(false).
> See [https://jdbc.postgresql.org/documentation/93/query.html#fetchsize-example]
> See [https://jdbc.postgresql.org/documentation/head/connect.html] for the list of all connection string properties.
> Fix is to add a property 'defaultAutoCommit' to JdbcStorageConfig and call BasicDataSource#setDefaultAutoCommit in JdbcStoragePlugin.
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