4.1. On the core slave node, upgrade the HDFS DataNode

  1. Shut down the current DataNode:

    su – hdfs -c "hdfs dfsadmin -shutdownDatanode <DATANODE_HOST:IPC_PORT> upgrade"

    For example:

    su - hdfs -c "hdfs dfsadmin -shutdownDatanode hdp1.lcl:8010 upgrade"
    Submitted a shutdown request to datanode hdp1.lcl:8010
  2. Check to make sure the DataNode has stopped:

    su - hdfs -c "hdfs dfsadmin -getDatanodeInfo <DATANODE_HOST:IPC_PORT> upgrade"

    If the DataNode stopped successfully you’ll see a series of retry messages, followed by "Datanode unreachable."

  1. Switch to the new version and start the DataNode:

    hdp-select set hadoop-hdfs-datanode

    su - hdfs -c "/usr/hdp/current/hadoop-hdfs-datanode/../hadoop/sbin/hadoop-daemon.sh start datanode"

  2. To verify that the new DataNode joined the HDFS cluster, list live HDFS processes:

    su - hdfs -c "hdfs dfsadmin -report -live"

    The report should list the upgraded DataNode as a live node.

    Type Control-C to exit the utility.

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