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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4435) The JobTracker should display the amount of heap memory used
Date Fri, 17 Oct 2008 18:17:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640607#action_12640607
] 

dhruba borthakur commented on HADOOP-4435:
------------------------------------------

The reason I was marking this as a blocker is because it exposes a new public API that allows
an external process to monitor the memory consumption on the JT. Hive monitors this resource
usage on the JT and throttles new jobs from getting into the cluster. This patch enables a
very powerful functionality in Hive. That's the reason why I would like to get this into 0.19.
I will submit a patch that changes the ClientProtocol.

> The JobTracker should display the amount of heap memory used
> ------------------------------------------------------------
>
>                 Key: HADOOP-4435
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4435
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>            Priority: Minor
>             Fix For: 0.20.0
>
>         Attachments: clusterSummary.patch
>
>
> It would be nice to make the JobTracker UI display the amount of heap memory currently
in use. This is similar to the DFS UI that already displays the amount if heap memory used
by the NameNode.

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