Brian,
Works for me now.. one should point the "servers" param to the multicast
address that gmond writes to and listens on... and not the ganglia server.
Started working once I did this.
thanks for you inputs,
-G.
On Tue, Aug 24, 2010 at 7:12 PM, Brian Bockelman <[email protected]>wrote:
>
> On Aug 24, 2010, at 8:27 AM, Gautam wrote:
>
> > 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 possibly misleading - netcat won't work if Hadoop is using UDP.
>
> My advice is to do:
>
> telnet $Ganglia_Server 9988
>
> and see if it spits out a bunch of XML. In the typical Ganglia
> configuration, it is set up to listen on UDP and write on TCP of the same
> port.
>
> A third thing to test is to switch the hadoop-metrics back to the file
> output, and make sure something gets written to the log file. The issue
> might be upstream.
>
> Brian
>
> >
> > This is what most of my hadoop-metrics looks like:
> >
> > dfs.class=org.apache.hadoop.metrics.ganglia.GangliaContext31
> > dfs.period=10
> > dfs.fileName=/tmp/dfsmetrics.log
> > dfs.servers=$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
>
>
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