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BigData / Hadoop basics

What is the single point of failure in a Hadoop cluster?

The single point of failure in a Hadoop cluster is the NameNode. While the loss of any other machine does not result in data loss, NameNode loss results in cluster unavailability. The permanent loss of NameNode data would render the cluster's HDFS inoperable.

Therefore, the step should be taken in this configuration to back up the NameNode metadata.

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