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https://issues.apache.org/jira/browse/HADOOP-3758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613496#action_12613496
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Raghu Angadi commented on HADOOP-3758:
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In addition, DN should update lastHeartBeat time even if sendHeartbeat()
results in an exception.. this will avoid similar problems with future errors.
> Excessive exceptions in HDFS namenode log file
> ----------------------------------------------
>
> Key: HADOOP-3758
> URL: https://issues.apache.org/jira/browse/HADOOP-3758
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.1
> Reporter: Jim Huang
> Assignee: Lohit Vijayarenu
> Priority: Blocker
>
> I upgraded a big cluster, out of which 10 nodes did not get upgraded.
> The namenode log showed excessive exceptions, causing the namenode log to ate
> the entire partition space, in this case close to 700GB log file was
> generated on the namenode.
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