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https://issues.apache.org/jira/browse/HDFS-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902730#action_12902730
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Hairong Kuang commented on HDFS-1203:
-------------------------------------
It's better if the sleep interval could take the configured heartbeat interval
into consideration. For example, setting it to be the min of 1000 & the
heartbeat interval.
> 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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