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Date: Thu, 29 Jan 2009 12:09:59 -0800 (PST)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5083) Optionally a separate daemon should
 serve JobHistory
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    [ https://issues.apache.org/jira/browse/HADOOP-5083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668581#action_12668581 ] 

dhruba borthakur commented on HADOOP-5083:
------------------------------------------

Hi Amar, 

I have a couple of questions about the history server:

1. If a job is completed and retired, and then the JT as well as the History Server restarts. Can a user get to the logs of a job that was completed earlier?

2. Does the History Server keep some sort of an persistent index into the completed/failed jobs? 

> Optionally a separate daemon should serve JobHistory
> ----------------------------------------------------
>
>                 Key: HADOOP-5083
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5083
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Arun C Murthy
>            Assignee: Amar Kamat
>         Attachments: HADOOP-5083-v1.2.patch, HADOOP-5083-v1.9.patch
>
>
> Currently the JobTracker serves the JobHistory to end-users off files local-disk/hdfs. While running very large clusters with a large user-base might result in lots of traffic for job-history which needlessly taxes the JobTracker. The proposal is to have an optional daemon which handles serving of job-history requests.

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