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https://issues.apache.org/jira/browse/HADOOP-4016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645626#action_12645626
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dhruba borthakur commented on HADOOP-4016:
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>Changed the entry on the tasktracker to reflect the new (old) hostname to
>(new) ip mapping
hi amar, can u pl explain what precisely u changed on the tasktracker machines?
> TaskTrackers never (re)connect back to the JobTracker if the JobTracker
> node/machine is changed
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-4016
> URL: https://issues.apache.org/jira/browse/HADOOP-4016
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Amar Kamat
>
> I tried the following
> 1) Started a hadoop cluster.
> 2) Killed the JT
> 3) Selected a new node for starting JT.
> 4) Changed the entry on the tasktracker to reflect the new (old) hostname to
> (new) ip mapping. Checked if the tracker node correctly resolves the hostname
> to the new ip.
> 5) Start the JT on the new node
> The tasktracker fails to connect to the new jobtracker. It seems that the
> hostname resolution remains stale and is never updated.
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