Decommissioning a Master or Slave
Decommissioning is a process that supports removing components and their hosts from the cluster. You must decommission a master or slave running on a host before removing it or its host from service. Decommissioning helps you to prevent potential loss of data or disruption of service . Decommissioning is available for the following component types:
DataNodes
NodeManagers
RegionServers
Decommissioning executes the following tasks:
- For DataNodes
Safely replicates the HDFS data to other DataNodes in the cluster
- For NodeManagers
Stops accepting new job requests from the masters and stops the component
- For RegionServers
Turns on drain mode and stops the component