Is hadoop a memory?
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What is a 'block' in HDFS?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
What is the purpose of DataNode block scanner?
What are watches?
What is the jobtracker?
What will be the consideration while we do Hardware Planning for Master in Hadoop architecture?
On what basis data will be stored on a rack?
What is Rack awareness?
What are the basic available commands in Hadoop sqoop ?
How many instances of tasktracker run on a hadoop cluster?
What is HDFS Federation?
Explain the difference between gen1 and gen2 hadoop with regards to the namenode?