FAQ
Hi.
I do have CDH 4.1.1 cluster and ganglia:
Ganglia Web Frontend version 3.1.7
Ganglia Web Backend *(gmetad)* version 3.1.7

I have:
1 namenode
3 datanodes.
I would like to monitor HDFS and MR activities using Ganglia

I did setup Ganglia on namenode.
I can access web interface, it shows CPU load, memory load, quantity of
running processes.

Then I went to CDH manager and tried to setup monitoring params there.
At first I tried to set MR monitoring:

1. Services» Service mapreduce1» .
.
*TaskTracker Settings *

Hadoop Metrics Class from org.apache.hadoop.metrics.spi.NoEmitMetricsContextto
org.apache.hadoop.metrics.ganglia.GangliaContext31
Hadoop Metrics Ganglia Servers from nothing to 10.66.48.23:8649


*JobTracker Settings *

Hadoop Metrics Class from org.apache.hadoop.metrics.spi.NoEmitMetricsContext
to org.apache.hadoop.metrics.ganglia.GangliaContext31
Hadoop Metrics Ganglia Servers from nothing to 10.66.48.23:8649


Then I've restarted Mapreduce service.
Then I started Hive query.
I don't see anything in Ganglia

2. HFDS
I don't have any Idea how to monitor HDFS activity using Ganglia :(

What do I do wrong?

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