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https://issues.apache.org/jira/browse/HADOOP-4209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632504#action_12632504
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Owen O'Malley commented on HADOOP-4209:
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I would propose that we should extend the jobid by HHMM, which will make all
job ids where the JobTracker stays up more than a minute unique. I hope that is
enough and that we don't really expect our JobTracker to only last 30 seconds
and to launch jobs in that time. *grin*
> 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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