What Mapper does?
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How does a namenode handle the failure of the data nodes?
What do the master class and the output class do?
What is a heartbeat in HDFS?
What is the jobtracker?
What are the modes in which Apache Hadoop run?
What alternate way does HDFS provides to recover data in case a Namenode
What is a Record Reader in hadoop?
What is the difference between rdbms and hadoop?
What is Distributed Cache?
Rack awareness of Namenode?
What do slaves consist of?
what are the steps involved in decommissioning removing
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