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Date: Tue, 28 Sep 2010 17:21:35 -0400 (EDT)
From: "Devaraj Das (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-2089) JobToken should be passed over
 RPC
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-2089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915927#action_12915927 ] 

Devaraj Das commented on MAPREDUCE-2089:
----------------------------------------

A note i forgot to put earlier - the trunk patches here are a port of Owen's original patch for Y20S. 

> JobToken should be passed over RPC
> ----------------------------------
>
>                 Key: MAPREDUCE-2089
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2089
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: client, job submission, jobtracker, security, task, tasktracker
>            Reporter: Devaraj Das
>            Assignee: Devaraj Das
>             Fix For: 0.22.0
>
>         Attachments: mr-2089.patch, mr-2089.patch
>
>
> JobToken file is currently created by the JobTracker, and stored in the HDFS. Later on, the TaskTrackers pull that file from the HDFS as part of job localization. The HDFS operations can be avoided if the the jobToken file is passed over RPC (Jobclient -> JobTracker -> TaskTrackers).

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