For ensuring high availability, Hadoop 2.x introduced ____ as a new feature for the NameNode.
- Backup NameNode
- Checkpoint NameNode
- Secondary NameNode
- Standby NameNode
Hadoop 2.x introduced the Standby NameNode to ensure high availability in the Hadoop cluster. The Standby NameNode maintains a copy of the metadata, and in case of a failure of the active NameNode, it can take over to avoid downtime and ensure continuous operation.
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