3. Downgrade components outside of the cluster

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

  • Components outside of the cluster: Hue, Kafka, Storm

  • Knox

  • Non-core cluster components: Falcon, Oozie, Hive

  • Core slave nodes: DataNodes, NodeManager, RegionServer

  • Core masters: HDFS, YARN, HBase

  • Ranger

  • Zookeeper

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