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

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

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."

Switch to the new version and start the DataNode:

hdp-select set hadoop-hdfs-datanode 2.2.6.0-2800

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

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.