In Apache Hadoop's HDFS (Hadoop Distributed File System), a heartbeat

What is a heartbeat in HDFS?

Question Posted / Rajesh Chauhan

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Answer Posted / Rajesh Chauhan

In Apache Hadoop's HDFS (Hadoop Distributed File System), a heartbeat is a message sent by the DataNodes to the NameNode periodically to indicate that they are still running and functioning correctly. The default interval for sending these messages is 3 seconds.

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