What does heartbeat in HDFS means?
Posted On: Feb 22, 2018
A heartbeat is an indication of the signal that it is alive. A data-node sends a pulse to Name-node and task tracker will send its heartbeat to job tracker. If the Name-node or job tracker does not get a heartbeat, then they will choose that there is some issue in data-node or task tracker is unable to perform the assigned task.
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