Explain what you understand by speculative execution
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What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?
Write a Mapreduce Program for Character Count ?
What is streaming?
How hadoop mapreduce works?
Can there be no Reducer?
What is identity mapper and identity reducer?
What is the key- value pair in Hadoop MapReduce?
How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?
What combiners are and when you should utilize a combiner in a map reduce job?
what daemons run on a master node and slave nodes?
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