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Active & Standby NameNode in Big Data Hadoop

* If one NameNode goes down, the other NameNode can take over the responsibility and reduce the cluster down time.
* The standby NameNode serves the purpose of a backup NameNode (unlike the Secondary NameNode) which incorporate failover capabilities to the Hadoop cluster.
* StandbyNode, have automatic failover whenever a NameNode crashes (unplanned event) or failover during the maintenance period. Enabling HA is not mandatory. But, when it is enabled, we can't use Secondary Namenode.
* Either Secondary Namenode is enabled OR Standby Namenode is enabled.

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