6. Downgrade core slave nodes

At this stage, the following components have been upgraded and need to be downgraded:

  • Core slave nodes: DataNodes, NodeManager, RegionServer

  • Core masters: HDFS, YARN, HBase

  • Ranger

  • Zookeeper

 Downgrade these processes as a set, one node at a time, before proceeding to the next node:

  1. Downgrade HDFS DataNode, if present

  2. Downgrade YARN NodeManager, if present

  3. Downgrade HBase RegionServer, if present

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