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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1779) Should we provide a way to know JobTracker's memory info from client?
Date Mon, 17 May 2010 06:45:44 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868099#action_12868099
] 

Amar Kamat commented on MAPREDUCE-1779:
---------------------------------------

Why would client applications need JobTracker's memory information. I think the reason we
added it to ClusterStatus was that its maintained at one place and its passed it to the webui
for display. I dont think JobTracker's memory information should be a part of ClusterStatus.
If at all some admins require it, it should be made available via MRAdmin. I dont see any
reason why client should be aware of JobTracker's memory details. 

> Should we provide a way to know JobTracker's memory info from client?
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1779
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1779
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client, jobtracker
>    Affects Versions: 0.21.0
>            Reporter: Amareshwari Sriramadasu
>            Priority: Blocker
>             Fix For: 0.22.0
>
>
> In HADOOP-4435, in branch 0.20, getClusterStatus() method returns JobTracker's used memory
and total memory.
> But these details are missed in new api (through MAPREDUCE-777).
> If these details are needed only for web UI, I don't think they are needed for client.
> So, should we provide a way to know JobTracker's memory info from client?
> If yes, an api should be added in org.apache.hadoop.mapreduce.Cluster for the same.

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