Explain the general mapreduce algorithm
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Define MapReduce?
What is the input type/format in MapReduce by default?
Difference between mapreduce and spark
Is reduce-only job possible in Hadoop MapReduce?
What happens when a DataNode fails during the write process?
Explain what combiners are and when you should use a combiner in a mapreduce job?
What is the difference between a MapReduce InputSplit and HDFS block?
Define speculative execution?
Write a short note on the disadvantages of mapreduce
What are ‘reduces’?
what does the text input format do?
What is the default value of map and reduce max attempts?
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