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Posted to hdfs-dev@hadoop.apache.org by "John George (JIRA)" <ji...@apache.org> on 2011/03/11 18:11:00 UTC

[jira] Resolved: (HDFS-307) Namenode GUI does not show actual memory usage

     [ https://issues.apache.org/jira/browse/HDFS-307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John George resolved HDFS-307.
------------------------------

       Resolution: Invalid
    Fix Version/s: 0.23.0
                   0.22.0

This is fixed in trunk.

> Namenode GUI does not show actual memory usage
> ----------------------------------------------
>
>                 Key: HDFS-307
>                 URL: https://issues.apache.org/jira/browse/HDFS-307
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Qi Liu
>            Assignee: John George
>            Priority: Minor
>             Fix For: 0.22.0, 0.23.0
>
>         Attachments: a.patch
>
>
> In the namenode GUI, the showed memory usage is not the actual memory usage. Instead, it is the memory currently allocated to Java (Runtime.totalMemory()). That's why we see most of the time, the memory usage is 100%. This is a concern for operation, since this is the only page we can monitor the memory usage of a name node. Showing 100% makes the wrong impression that there is a memory leak in name node, and the name node needs to be restarted.
> The current value should show would be Runtime.totalMemory() - Runtime.freeMemory().

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