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What do you mean by the high availability of a namenode? How is it achieved?
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Answer Posted / Rajesh Kumar Saroj
High availability of a Namenode in Apache HDFS (Hadoop Distributed File System) refers to the ability to ensure continuous accessibility and uninterrupted operation of the system, even during hardware or software failures. This is primarily achieved through redundancy: a secondary NameNode is always running and can take over from the primary NameNode when it fails. The secondary NameNode performs various tasks such as checkpointing (taking snapshots of the NameNode's filesystem image) and performing an edit log to minimize data loss during disaster recovery.
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