The dfs webui (dfshealth) shows "Last Contact" as a negative number
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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
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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