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How NameNode tackle Datanode failures in HDFS?
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Answer / Rajesh Kumar Sahu
NameNode handles DataNode failures in HDFS (Hadoop Distributed File System) by monitoring the heartbeats sent by each DataNode. When a DataNode fails to send its heartbeat, the NameNode marks it as dead and begins re-replicating any blocks that were stored on the failed DataNode across other healthy DataNodes to maintain data availability and reliability.
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