# Hadoop and Spark metrics in Ganglia
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**Note**  
The last release of Amazon EMR to include Ganglia was Amazon EMR 6.15.0. To monitor your cluster, releases higher than 6.15.0 include the [Amazon CloudWatch agent](emr-AmazonCloudWatchAgent.md).

 Ganglia reports Hadoop metrics for each instance. The various types of metrics are prefixed by category: distributed file system (dfs.\$1), Java virtual machine (jvm.\$1), MapReduce (mapred.\$1), and remote procedure calls (rpc.\$1). 

YARN-based Ganglia metrics such as Spark and Hadoop are not available for EMR release versions 4.4.0 and 4.5.0. Use a later version to use these metrics.

Ganglia metrics for Spark generally have prefixes for YARN application ID and Spark DAGScheduler. So prefixes follow this form: 
+ DAGScheduler.\$1
+ application\$1xxxxxxxxxx\$1xxxx.driver.\$1
+ application\$1xxxxxxxxxx\$1xxxx.executor.\$1