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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1203) DataNode should sleep before reentering service loop after an exception
Date Thu, 19 Aug 2010 00:45:22 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jakob Homan updated HDFS-1203:

    Status: Patch Available  (was: Open)

Re-submitting to Hudson to get another run of the tests, just for completeness, since the
original run has expired.  However, Hudon's not been around a lot lately, and so it may be
more expedient for Todd to run the tests locally and report the results here, if he wishes.

> DataNode should sleep before reentering service loop after an exception
> -----------------------------------------------------------------------
>                 Key: HDFS-1203
>                 URL: https://issues.apache.org/jira/browse/HDFS-1203
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.22.0
>         Attachments: hdfs-1203.txt
> When the DN gets an exception in response to a heartbeat, it logs it and continues, but
there is no sleep. I've occasionally seen bugs produce a case where heartbeats continuously
produce exceptions, and thus the DN floods the NN with bad heartbeats. Adding a 1 second sleep
at least throttles the error messages for easier debugging and error isolation.

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