What do masters consist of?
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How did you debug your Hadoop code ?
Where do you specify the Mapper Implementation?
What is the communication channel between client and namenode/datanode?
Which data storage components are used by hadoop?
What is Disk Balancer in Apache Hadoop?
What is a Secondary Namenode? Is it a substitute to the Namenode?
How is hadoop different from other data processing tools?
What does ‘jps’ command do?
What are the problems with Hadoop 1.0?
Define a job tracker?
Which command is used for the retrieval of the status of daemons running the hadoop cluster?
How many instances of tasktracker run on a hadoop cluster?