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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-3983) Scheduler delay (shown in the UI) is incorrect
Date Fri, 17 Oct 2014 01:12:34 GMT

    [ https://issues.apache.org/jira/browse/SPARK-3983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174577#comment-14174577
] 

Apache Spark commented on SPARK-3983:
-------------------------------------

User 'kayousterhout' has created a pull request for this issue:
https://github.com/apache/spark/pull/2832

> Scheduler delay (shown in the UI) is incorrect
> ----------------------------------------------
>
>                 Key: SPARK-3983
>                 URL: https://issues.apache.org/jira/browse/SPARK-3983
>             Project: Spark
>          Issue Type: Bug
>          Components: Web UI
>            Reporter: Kay Ousterhout
>            Assignee: Kay Ousterhout
>             Fix For: 1.2.0
>
>
> The reported scheduler delay includes time to get a new thread (from a threadpool) in
order to start the task, time to deserialize the task, and time to serialize the result. 
None of these things are delay caused by the scheduler; including them as such is misleading.
> This is especially problematic when debugging performance of short tasks (that run in
10s of milliseconds), when the scheduler delay can be very large relative to the task duration.
> cc [~sparks] [~shivaram]



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