A secondary namenode is a backup for the primary namenode in Hadoop. It per

What is a secondary namenode?

Question Posted / Deep Kamal Tiwari

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Answer Posted / Deep Kamal Tiwari

A secondary namenode is a backup for the primary namenode in Hadoop. It periodically checks the integrity of the NameNode's edit log and the checkpoint files, and when the primary namenode fails or restarts, the secondary namenode can take over its duties.

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