Apache Hadoop High Availability
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Deploy NameNode HA Cluster

HA configuration is backward compatible and works with your existing single NameNode configuration. The following instructions describe how to set up NameName HA on a manually-installed cluster. If you installed with Ambari and manage HDP on Ambari 2.0.0 or later, instead of the manual instructions use the Ambari documentation for the NameNode HA wizard.

[Note]Note

HA cannot accept HDFS cluster names that include an underscore (_).

To deploy a NameNode HA cluster, use the steps in the following subsections.