Mention when to use Map reduce mode?
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How do ‘map’ and ‘reduce’ work?
How can we control particular key should go in a specific reducer?
what happens in textinformat ?
Explain combiners.
Explain what you understand by speculative execution
What is the fundamental difference between a MapReduce InputSplit and HDFS block?
In MapReduce, ideally how many mappers should be configured on a slave?
when do reducers play their role in a mapreduce task?
What platform and Java version is required to run Hadoop?
what is storage and compute nodes?
How many Reducers run for a MapReduce job?
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
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