I was trying to get Ganglia 3.1 to work with the stable hadoop-0.20.2 version from Apache. I patched this release from HADOOP-4675 using HADOOP-4675-v7.patch as suggested by CDH3 release notes [1] I am unable to see any hadoop metrics on the Ganglia monitoring UI. The other metrics that gmond spews (system CPU/Memory etc) seem to work.
When I switch to FileContext the metrics are written properly to the log file. Once I moved to GangliaContext31 it doesn't show anything. I tried pointing the "servers" param to localhost:8649 while listening on that port using netcat on that machine... nothing comes up on netcat. Has anyone faced this issue? This is what most of my hadoop-metrics looks like: dfs.class=org.apache.hadoop.metrics.ganglia.GangliaContext31 dfs.period=10 dfs.fileName=/tmp/dfsmetrics.log dfs.servers=$Ganglia_Server:9988 # Configuration of the "mapred" context for null mapred.class=org.apache.hadoop.metrics.ganglia.GangliaContext31 mapred.period=10 mapred.fileName=/tmp/mrmetrics.log mapred.servers=$Ganglia_Server:9988 # Configuration of the "jvm" context for null jvm.class=org.apache.hadoop.metrics.ganglia.GangliaContext31 jvm.period=10 jvm.fileName=/tmp/jvmmetrics.log jvm.servers=$GANGLIA_SERVER:9988 -G. [1] - http://archive.cloudera.com/cdh/3/hadoop-0.20.2+228.CHANGES.txt
