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|Java - Interview Questions and Answers|
|Ans. Combiners are used to increase the efficiency of a Map Reduce program. They are used to aggregate intermediate map output locally on individual mapper outputs. Combiners can help you reduce the amount of data that needs to be transferred across to the reducers.|
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|What is the difference between namenode and datanode in Hadoop?|
|Which is the default Input Formats defined in Hadoop ?|
|Which of the following is not an input format in Hadoop ?|
|Which of the following is a valid flow in Hadoop ?|
|MapReduce was devised by ...|
|Which of the following is not a phase of Reducer ?|
| How many instances of Job tracker can run on Hadoop cluster ? |
|Which of the following is not the Dameon process that runs on a hadoop cluster ?|
|What is a Sequence File?|
|What is the input to the Reduce function ?|