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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4435) The JobTracker should display the amount of heap memory used
Date Tue, 28 Oct 2008 05:06:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12643140#action_12643140

Amar Kamat commented on HADOOP-4435:

bq. What if we display heap-details as part of cluster-summary. 
What I mean was to have _heap-info_ as a part of (i.e inside) the cluster summary table and
not at the header but I wrongly showed it as a part of the JT info. Sorry for the confusion.
So +1.

Few comments on the patch
1) I think changes to {{DatanodeDescriptor.java}} are unnecessary. 
2) Deprecate {{FsShell.byteDesc()}} and {{FsShell.limitDecimalTo2()}}. Point {{StringUtil.byteDesc()/StringUtil.limitDecimalTo2()}}
in the comment.
3) Change the code that use {{FsShell.byteDesc()/FsShell.limitDecimalTo2}} to use {{StringUtils.byteDesc()/StringUtil.limitDecimalTo2()}}.
4) Do we need to show the heap info through cli?

> 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, clusterSummary.patch, clusterSummary2.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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