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From "Kay Ousterhout (JIRA)" <>
Subject [jira] [Updated] (SPARK-3983) Scheduler delay (shown in the UI) is incorrect
Date Fri, 17 Oct 2014 01:12:34 GMT


Kay Ousterhout updated SPARK-3983:
    Component/s: Web UI

> Scheduler delay (shown in the UI) is incorrect
> ----------------------------------------------
>                 Key: SPARK-3983
>                 URL:
>             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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