Exposing Hadoop Metrics to Ganglia

Minimum Required Role: Configurator (also provided by Cluster Administrator, Full Administrator)

1. Go to the Home page by clicking the Cloudera Manager logo.
2. Click Configuration > Advanced Configuration Snippets.
3. Search on the term Metrics.
4. To configure HDFS, YARN, or HBase, use Hadoop Metrics2 Advanced Configuration Snippet (Safety Valve). For MapReduce1 (or HBase), use Hadoop Metrics Advanced Configuration Snippet (Safety Valve).
5. Click Edit Individual Values to see the supported daemons and their default groups.
6. Configure each default group with a metrics class, sampling period, and Ganglia server. See the tables below.
7. To add optional parameters for socket connection retry, modify this example as necessary:

   *.sink.ganglia.retry_socket_interval=60000 #in milliseconds
   *.sink.ganglia.socket_connection_retries=10 #Set it to 0 if you do not want it to be retried 

8. To define a filter, which is recommended for preventing YARN metrics from overwhelming the Ganglia server, do so on the sink side. For example:

   *.source.filter.class=org.apache.hadoop.metrics2.filter.GlobFilter
   *.record.filter.class=${*.source.filter.class}
   *.metric.filter.class=${*.source.filter.class}
   nodemanager.sink.ganglia.record.filter.exclude=ContainerResource*

9. Click Save Changes.
10. Restart the Cluster or Service depending on the scope of your changes.