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From "Brian Bockelman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4675) Current Ganglia metrics implementation is incompatible with Ganglia 3.1
Date Tue, 18 Nov 2008 04:45:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648494#action_12648494

Brian Bockelman commented on HADOOP-4675:

Looking at the new Ganglia wire protocol, we'll probably need to do the following:
1) Implement more XDR serializations.  3.0.x protocol sends all data as strings; 3.1.x correctly
sends float data as XDR floats.
2) Test and verify sending Longs as floats in Ganglia actually works.  This has been discussed,
but I'm not sure it's entirely functional... maybe get a test case going?
3) Probably this will result in a new GangliaContext31 class, as I don't see any clean way
to merge the two protocols together into one class.
  - The patch for HADOOP-3422 caused a new metric name to be generated in the emitRecord class;
we could reuse this if it was separated out into a new function.


> Current Ganglia metrics implementation is incompatible with Ganglia 3.1
> -----------------------------------------------------------------------
>                 Key: HADOOP-4675
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4675
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: metrics
>    Affects Versions: 0.18.2
>            Reporter: Brian Bockelman
> Ganglia changed its wire protocol in the 3.1.x series; the current implementation only
works for 3.0.x.

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