Considering a case where a Hadoop cluster's NameNode becomes unavailable, what steps should be taken to recover the system?

  • Increase the replication factor
  • Reboot the entire cluster
  • Restart the DataNodes
  • Restore from a backup
In the event of a NameNode failure, the system can be recovered by restoring it from a backup. Regular backups of the NameNode metadata are essential for quick and efficient recovery in case of a NameNode failure.
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