Upgrade core slave nodes (HDFS, YARN, HBase)
Each core slave node in the cluster has an HDFS DataNode process, a YARN NodeManager process, and (optionally) an HBase RegionServer process.
Upgrade these processes as a set, one node at a time, before proceeding to the next node:
Upgrade HDFS DataNode, if present
Upgrade YARN NodeManager, if present
Upgrade HBase RegionServer, if present