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https://issues.apache.org/jira/browse/SPARK-21993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-21993.
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Resolution: Not A Problem
> Close CliSessionState in shutdown hook of SparkSQLCLIDriver
> -----------------------------------------------------------
>
> Key: SPARK-21993
> URL: https://issues.apache.org/jira/browse/SPARK-21993
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: jin xing
> Priority: Major
>
> In current code, {{SessionState}} in {{SparkSQLCLIdriver}} is not guaranteed
> to be closed. As a result, some tmp files/dirs are not removed when job
> finished. We can close {{SessionState}} in shutdown hook.
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