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InterviewSolution
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What is the Heartbeat in Hadoop? |
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Answer» The heartbeat is a communication link that runs between the NAMENODE and the Datanode. It's the signal that the Datanode SENDS to the Namenode at REGULAR INTERVALS. If a Datanode in HDFS fails to send a heartbeat to Namenode after 10 MINUTES, Namenode assumes the Datanode is unavailable. |
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