Explain what is speculative execution?
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What is a namenode?
What is Combiner in Hadoop?
How many daemon processes run on a hadoop cluster?
Explain how jobtracker schedules a task?
How Hadoop’s CLASSPATH plays a vital role in starting or stopping in Hadoop daemons?
How can we create a hadoop cluster from scratch?
Clarify how ordering in hdfs is finished?
When should be hadoop archive create?
Who are ‘Data Scientists’?
Which operating system(s) are supported for production hadoop deployment?
What do you understand by standalone (or local) mode?
What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?
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