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Feb 23 in Big Data | Hadoop
Q:

What is a heartbeat in HDFS?

1 Answer

Feb 23

A heartbeat is a signal indicating that it is alive. A datanode sends heartbeat to Namenode and task tracker will send its heart beat to job tracker. If the Namenode or job tracker does not receive heart beat then they will decide that there is some problem in datanode or task tracker is unable to perform the assigned task.

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