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https://issues.apache.org/jira/browse/DRILL-7459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Arina Ielchiieva resolved DRILL-7459.
-------------------------------------
Resolution: Fixed
Was fixed in the scope of DRILL-7467.
The following plugin configuration should be used to support batches:
{noformat}
{
"type": "jdbc",
"driver": "org.postgresql.Driver",
"url": "jdbc:postgresql://localhost:5959/my_db?defaultRowFetchSize=2",
"username": "my_user",
"password": "my_pass",
"caseInsensitiveTableNames": false,
"sourceParameters": {
"defaultAutoCommit": false
},
"enabled": true
}
{noformat}
> 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
> Assignee: Arina Ielchiieva
> Priority: Major
> Fix For: 1.18.0
>
>
> 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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