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https://issues.apache.org/jira/browse/SPARK-25523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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huanghuai updated SPARK-25523:
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Summary: Multi thread execute sparkSession.read().jdbc(url, table,
properties) problem (was: Multithreading executive
sparkSession.read().jdbc(url, table, properties) problem)
> Multi thread execute sparkSession.read().jdbc(url, table, properties) problem
> -----------------------------------------------------------------------------
>
> Key: SPARK-25523
> URL: https://issues.apache.org/jira/browse/SPARK-25523
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Environment: h3. [IntelliJ
> _IDEA_|http://www.baidu.com/link?url=7ZLtsOfyqR1YxLqcTU0Q-hqXWV_PsY6IzIzZoKhiXZZ4AcLrpQ4DoTG30yIN-Gs8]
>
> local mode
>
> Reporter: huanghuai
> Priority: Major
>
> when i execute sparkSession.read().jdbc(url, table, properties) in 2 or 3
> thread , it will be in limitless waiting.
>
> I found it by debug step by step, and finally waited here:
> JdbcRelationProvider.createRelation() method
> at line 34:
> val jdbcOptions = new JDBCOptions(parameters)
>
> when I press F8, Spark did not run away.
>
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