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Date: Wed, 18 Aug 2010 20:43:24 -0400 (EDT)
From: "Jakob Homan (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-1203) DataNode should sleep before reentering
 service loop after an exception
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     [ https://issues.apache.org/jira/browse/HDFS-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jakob Homan updated HDFS-1203:
------------------------------

     Hadoop Flags: [Reviewed]
       Issue Type: Improvement  (was: Bug)
    Fix Version/s: 0.22.0

+1. This sounds reasonable.

> 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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