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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HADOOP-1238) maps_running metric is only updated at the end of the task
Date Wed, 11 Apr 2007 19:43:32 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting reassigned HADOOP-1238:
------------------------------------

    Assignee: David Bowen

David, can you please look this over?  Thanks!

> maps_running metric is only updated at the end of the task
> ----------------------------------------------------------
>
>                 Key: HADOOP-1238
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1238
>             Project: Hadoop
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.12.3
>         Environment: ganglia metrics
>            Reporter: Michael Bieniosek
>         Assigned To: David Bowen
>            Priority: Minor
>         Attachments: fix-tasks-running-metric.patch
>
>
> The maps_running and reduces_running metrics aren't getting into ganglia correctly -
they always appear to be underestimated.  A quick look at the TaskTracker code shows that
these metrics are only updated when a task is finished.  Of course, once a task is finished,
the reporting will not note the completed task (since it's not running anymore).

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