Priyanka Bhoir created DRILL-7459: ------------------------------------- Summary: 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
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. -- This message was sent by Atlassian Jira (v8.3.4#803005)