4. 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:

  1. Upgrade HDFS DataNode, if present

  2. Upgrade YARN NodeManager, if present

  3. Upgrade HBase RegionServer, if present

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