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Posted to common-dev@hadoop.apache.org by "Devaraj Das (JIRA)" <ji...@apache.org> on 2007/07/04 18:08:05 UTC

[jira] Commented: (HADOOP-1562) Report Java VM metrics

    [ https://issues.apache.org/jira/browse/HADOOP-1562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510220 ] 

Devaraj Das commented on HADOOP-1562:
-------------------------------------

Code looks good. I have one comment - the way the objects of type JvmMetrics is different in the NameNode/DataNode from the way they are created in JobTracker/TaskTracker. I think it is better to have it uniform, i.e., pass sessionId even to the NameNode's & DataNode's JvmMetrics objects. That is more flexible also since we can then distinguish metrics collected from different DFS instances (sessions).

> Report Java VM metrics
> ----------------------
>
>                 Key: HADOOP-1562
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1562
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: metrics
>            Reporter: David Bowen
>            Assignee: David Bowen
>         Attachments: 1562.patch
>
>
> It would be useful to have each Java process in Hadoop (JobTracker, TaskTracker, NameNode and DataNode) report some Java VM metrics.  E.g. heap/non-heap memory used/committed, number of garbage collections and percentage of time spent in GC, number of threads that are runnable/blocked/waiting/etc.

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