Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/108#issuecomment-37137320
@aarondav the spark-ec2 scripts set up a ganglia cluster separately... they
actually don't use the `GangliaSink` in Spark at present. If change spark ec2
to use that then yep, we'll have to use a special build of Spark for those
scripts that includes the gaglia library.
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