Scaling Namespaces and Optimizing Data Storage
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Configure a federation with a cluster upgrade

Hortonworks Data Platform versions starting with 3.0.0 support HDFS federations. You can configure the federation as you upgrade your cluster.

Use the hdfs start namenode command during the upgrade process as specified.
hdfs start namenode --config $HADOOP_CONF_DIR  -upgrade -clusterId <cluster_ID>
If you do not specify the Cluster ID, then a unique ID is auto-generated.