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https://issues.apache.org/jira/browse/HADOOP-12357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14715314#comment-14715314
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Dave Marion commented on HADOOP-12357:
--------------------------------------

I had a misunderstanding. I was under the impression that Graphite and StatsD 
used the same protocol. It turns out that the StatsD protocol is different 
(<metricname>:<value>|<type>) and the StatsD daemon listens on UDP. Graphite 
listens on TCP with a different plaintext protocol (<metric path> <metric 
value> <metric timestamp>). I think that I can either close this ticket and 
open a new one for a StatsD metrics2 sink, or just change the description of 
this ticket and supply a new patch. Is there a preference?

> GraphiteSink won't connect to UDP sockets
> -----------------------------------------
>
>                 Key: HADOOP-12357
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12357
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 2.5.0, 2.5.1, 2.5.2, 2.6.0, 2.7.0, 2.7.1
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>            Priority: Minor
>         Attachments: HADOOP-12357.001.patch, HADOOP-12357.002.patch
>
>
> The statsd plugin within CollectD listens on a UDP socket. In trying to set 
> this up, I keep getting a connection refused error, and I think the issue is 
> that the current implementation of GraphiteSink only uses a TCP socket.



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