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https://issues.apache.org/jira/browse/SPARK-29972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16978461#comment-16978461
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Sean R. Owen commented on SPARK-29972:
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I am not sure we want to do this. What if I want to restart a session after the
last one is closed?
> Manage/trace all spark sessions
> -------------------------------
>
> Key: SPARK-29972
> URL: https://issues.apache.org/jira/browse/SPARK-29972
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Lantao Jin
> Priority: Major
>
> Current there is no place to trace all live spark sessions in a
> non-thrift-server application. For example spark session can be stored in
> thread local variable and be garbage collection when user's thread exit. So
> it may has some problems like memory leak in an application. Also, seems we
> don't have such an action called "close session" in Spark SQL.
> SparkSession.close closes the SparkContext and thus closes all sessions.
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