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What is Secondary Namenode Recovery in Hadoop about?

This document discusses recovering from Namenode failure in Hadoop. It explains that the Namenode is a single point of failure and stores all HDFS metadata. If it fails, the entire cluster becomes unavailable. However, checkpoints of the metadata are periodically taken by the Secondary Namenode and stored on its local disk. These checkpoints can be used to recover the Namenode by copying the latest fsimage file from the Secondary Namenode to the primary Namenode before restarting it and the HDFS services.

Author

vishnu

Language

EN