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|Java - Interview Questions and Answers|
|Ans. Hadoop is an open source framework , written in java by apche software foundation. This framework is used to write applications to process vast amount of data. Processing happens in parallel on large clusters which could have 1000 of computers. It processes data in a very reliable and fault tolerant manner.|
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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 ?|