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From "Brian Bockelman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3422) Ganglia counter metrics are all reported with the metric name "value", so the counter values can not be seen
Date Sat, 11 Oct 2008 03:26:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638708#action_12638708
] 

Brian Bockelman commented on HADOOP-3422:
-----------------------------------------

Hey stack,

1) I didn't add the log statements because I don't know the "preferred" way to add a logger
to classes for this project.  I hoped someone who knew would come along and help out.
2) I don't know the logic behind the ThreadLocal StringBuffer stuff.  Adoption from the original
patch.
3) The update to the patch which maps Long to float is bust.  The class doesn't have a way
to serialize floats with XDR, so I'm not sure what would happen.

For now, use the original, not the updated patch - having the buffer overflow is better than
nothing at all with floats.

> Ganglia counter metrics are all reported with the metric name "value", so the counter
values can not be seen
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3422
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3422
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.18.1
>            Reporter: Jason
>         Attachments: diff-20080520-1025.txt, ganglia-patch-3422-and-4137.patch, ganglia-patch-3422-and-4137.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> The JobInProgress class reports all metrics with the name "value". The FileMetrics class
puts all of the tags into the name when reporting the individual values, but the Ganglia Context
does not put the tags into the name..
> This patch modifies the context to build names for the counter metrics out of the tag
values. This enables the user to see the indivdual counter values with the ganglia web tool,
on a per job basis

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