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https://issues.apache.org/jira/browse/SPARK-794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14212088#comment-14212088
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Andrew Ash commented on SPARK-794:
----------------------------------

I don't see a {{ClusterScheduler}} class on master -- was that refactored to 
{{TaskSchedulerImpl}}?

There is still a {{Thread.sleep(1000)}} in that class's {{stop()}} though, 
which may be what this ticket refers to: 
https://github.com/apache/spark/blob/1df05a40ebf3493b0aff46d18c0f30d2d5256c7b/core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala#L399

> Remove sleep() in ClusterScheduler.stop
> ---------------------------------------
>
>                 Key: SPARK-794
>                 URL: https://issues.apache.org/jira/browse/SPARK-794
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 0.9.0
>            Reporter: Matei Zaharia
>
> This temporary change made a while back slows down the unit tests quite a bit.



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