Explanation:
Amazon Elastic Map Reduce (EMR) is a web service that enables businesses, researchers, dataanalysts, and developers to easily and cost-effectively process vast amounts of data. Amazon EMRhistorically referred to an Amazon EMR cluster (and all processing steps assigned to it) as a "cluster".
Every cluster has a unique identifier that starts with "j-". The different cluster states of an AmazonEMR cluster are listed below. STARTING? The cluster provisions, starts, and configures EC2 instances.
BOOTSTRAPPING - Bootstrap actions are being executed on the cluster.
RUNNING - A step for the cluster is currently being run.
WAITING - The cluster is currently active, but has no steps to run.
TERMINATING -The cluster is in the process of shutting down.
TERMINATED – The cluster was shut down without error.
TERMINATED_WITH_ERRORS - The cluster was shut down with errors.
Reference:
https://aws.amazon.com/elasticmapreduce/faqs/