What role does the Secondary NameNode play in HDFS?
- Backup Node
- Checkpointing Node
- Fault Tolerance
- Metadata Backup
The Secondary NameNode in HDFS is not a backup node but is responsible for performing periodic checkpoints of the file system metadata. It creates a merged, updated checkpoint from the edits log and the current metadata, reducing the time needed for the NameNode to recover in case of failure.
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