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https://issues.apache.org/jira/browse/HADOOP-4209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632545#action_12632545
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Owen O'Malley commented on HADOOP-4209:
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+1 to keeping a count in the JobInProgress that is originally 0 and incremented 
by one every time the history is reread/restored. 

> The TaskAttemptID should not have the JobTracker start time
> -----------------------------------------------------------
>
>                 Key: HADOOP-4209
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4209
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>            Priority: Blocker
>             Fix For: 0.19.0
>
>
> The TaskAttemptID now includes the redundant copy of the JobTracker's start 
> time as milliseconds. We should instead change the JobID to have the longer 
> unique string.

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