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https://issues.apache.org/jira/browse/SPARK-11823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067345#comment-15067345
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Josh Rosen commented on SPARK-11823:
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I think I spotted the problem; it may be a bad use of Thread.sleep() in a test: 
https://github.com/apache/spark/pull/6207/files#r30935200

> HiveThriftBinaryServerSuite tests timing out, leaves hanging processes
> ----------------------------------------------------------------------
>
>                 Key: SPARK-11823
>                 URL: https://issues.apache.org/jira/browse/SPARK-11823
>             Project: Spark
>          Issue Type: Bug
>          Components: Tests
>            Reporter: shane knapp
>            Assignee: Josh Rosen
>         Attachments: 
> spark-jenkins-org.apache.spark.sql.hive.thriftserver.HiveThriftServer2-1-amp-jenkins-worker-05.out,
>  stack.log
>
>
> i've noticed on a few branches that the HiveThriftBinaryServerSuite tests 
> time out, and when that happens, the build is aborted but the tests leave 
> behind hanging processes that eat up cpu and ram.
> most recently, i discovered this happening w/the 1.6 SBT build, specifically 
> w/the hadoop 2.0 profile:
> https://amplab.cs.berkeley.edu/jenkins/job/Spark-1.6-SBT/AMPLAB_JENKINS_BUILD_PROFILE=hadoop2.0,label=spark-test/56/console
> [~vanzin] grabbed the jstack log, which i've attached to this issue.



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