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https://issues.apache.org/jira/browse/HADOOP-4869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12658049#action_12658049
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Amareshwari Sriramadasu commented on HADOOP-4869:
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All unit tests passed on my machine
> Lost Trackers may not be able to join back
> ------------------------------------------
>
> Key: HADOOP-4869
> URL: https://issues.apache.org/jira/browse/HADOOP-4869
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Devaraj Das
> Assignee: Amareshwari Sriramadasu
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: patch-4869.txt
>
>
> There is a bug in the heartbeat processing which shows up when TaskTrackers
> are lost. Due to the bug, lost TTs may not be able to join back the JT after
> reinitializing (and binding to a RPC port different from the previous one).
> This bug got introduced in HADOOP-4305.
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