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https://issues.apache.org/jira/browse/MAPREDUCE-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769011#action_12769011
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Devaraj Das commented on MAPREDUCE-1026:
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Actually, it probably makes sense to write the job token file during the job
initialization. The other place is to do it in the submitJob RPC method but it
would mean the RPC handler is blocked during the HDFS access.
> Shuffle should be secure
> ------------------------
>
> Key: MAPREDUCE-1026
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1026
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: security
> Reporter: Owen O'Malley
> Assignee: Boris Shkolnik
>
> Since the user's data is available via http from the TaskTrackers, we should
> require a job-specific secret to access it.
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