Answer / Mridul Mayank

To specify more than one directory as input to a MapReduce job, you can use the FileInputFormat.setInputPaths(JobContext, Path[]) method and pass an array of Path objects representing the directories.

Why Hadoop MapReduce?

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what job does the conf class do?

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How to sort intermediate output based on values in MapReduce?

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What is RecordReader in a Map Reduce?

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Explain what is the function of mapreduce partitioner?

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What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

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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?

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What main configuration parameters are specified in mapreduce?

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What do you mean by shuffling and sorting in MapReduce?

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What is the data storage component used by Hadoop?

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how can you check whether Namenode is working beside using the jps command?

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Explain the Reducer's reduce phase?

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