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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1203) DataNode should sleep before reentering service loop after an exception
Date Sat, 12 Jun 2010 00:01:15 GMT
DataNode should sleep before reentering service loop after an exception
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                 Key: HDFS-1203
                 URL: https://issues.apache.org/jira/browse/HDFS-1203
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
         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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