Following the instructions for "Initializing Ganglia on a Job Flow" I get my cluster up but don't see any Ganglia process running (on 8157). 

<http://docs.amazonwebservices.com/ElasticMapReduce/latest/DeveloperGuide/init_Ganglia.html>

elastic-mapreduce --create --alive --name "Tom's Daily Hive 8x Flow" --instance-type c1.medium --num-instances 8 --availability-zone us-east-1a --bootstrap-action "s3://elasticmapreduce/bootstrap-actions/install-ganglia" --stream

There is a 0K file in: /tmp/ganglia-installed

Any suggestions? Thanks!