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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-825) JobClient completion poll interval of 5s causes slow tests in local mode
Date Tue, 04 Aug 2009 20:56:14 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron Kimball updated MAPREDUCE-825:
------------------------------------

    Attachment: completion-poll-interval.patch

This patch adds the {{jobclient.completion.poll.interval}} mapreduce parameter, which defaults
to the existing value of 5000 ms. No new tests because this is a very small change; it's not
clear what new (or any) functionality needs additional verification.

> JobClient completion poll interval of 5s causes slow tests in local mode
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-825
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-825
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>            Priority: Minor
>         Attachments: completion-poll-interval.patch
>
>
> The JobClient.NetworkedJob.waitForCompletion() method polls for job completion every
5 seconds. When running a set of short tests in pseudo-distributed mode, this is unnecessarily
slow and causes lots of wasted time. When bandwidth is not scarce, setting the poll interval
to 100 ms results in a 4x speedup in some tests.  This interval should be parametrized to
allow users to control the interval for testing purposes.

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