How the Client communicates with HDFS?
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What is the default replication factor?
How many instances of a jobtracker run on hadoop cluster?
What is a task instance in hadoop? Where does it run?
What are the important differences between apache and hadoop?
what are the steps involved in commissioning adding
Have you ever used Counters in Hadoop. Give us an example scenario?
What is zookeeper in hadoop?
Explain how input and output data format of the hadoop framework?
What is the communication channel between client and namenode/datanode?
What is the difference between traditional RDBMS and Hadoop?
What happens to a NameNode that has no data?
If a data Node is full how it's identified?
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