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https://issues.apache.org/jira/browse/HADOOP-1613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HADOOP-1613:
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Status: Patch Available (was: Open)
> The dfs webui (dfshealth) shows "Last Contact" as a negative number
> -------------------------------------------------------------------
>
> Key: HADOOP-1613
> URL: https://issues.apache.org/jira/browse/HADOOP-1613
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Priority: Minor
> Attachments: lastContactTime.patch
>
>
> The dfshealth.jsp displays the number of seconds that have elapse since the
> namenode got a heartbeat from a datanode. When the number of nodes in the
> cluster are huge, may of these values are seen to be negative numbers.
> The FSNamesystem returns the timestamp when the namenode had last-heard from
> a datanode. The dfshealth.jsp gets the current system time and then subtracts
> the timestamp returned by the Namenode. This ordering of retrieving
> timestamps cause this problem.
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