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https://issues.apache.org/jira/browse/SPARK-17532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15488601#comment-15488601
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Apache Spark commented on SPARK-17532:
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User 'rdblue' has created a pull request for this issue:
https://github.com/apache/spark/pull/15088
> Add thread lock information from JMX to thread dump UI
> ------------------------------------------------------
>
> Key: SPARK-17532
> URL: https://issues.apache.org/jira/browse/SPARK-17532
> Project: Spark
> Issue Type: Improvement
> Components: Web UI
> Reporter: Ryan Blue
>
> It would be much easier to track down issues like SPARK-15725 if the thread
> dump page in the web UI displayed debugging info about what locks are
> currently held by threads. This is already available through the
> [ThreadMXBean|https://docs.oracle.com/javase/7/docs/api/java/lang/management/ThreadMXBean.html]
> that is used to get stack traces, thead ids, and names.
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