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Posted to issues@spark.apache.org by "Kay Ousterhout (JIRA)" <ji...@apache.org> on 2014/11/06 08:57:34 UTC
[jira] [Resolved] (SPARK-3983) Scheduler delay (shown in the UI) is
incorrect
[ https://issues.apache.org/jira/browse/SPARK-3983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kay Ousterhout resolved SPARK-3983.
-----------------------------------
Resolution: Fixed
> 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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