Answer / Chetan Warkari

Yes, it is possible to provide multiple inputs to Hadoop. This can be achieved by using multiple InputSplit objects in the custom InputFormat class, or by specifying multiple input paths when submitting a job using the 'hadoop jar' command. The InputFormat class should implement the 'getSplits()' method to return multiple InputSplit objects.

What is the default replication factor and how will you change it?

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Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?

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Can we deploy job tracker other than name node?

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What is a Heartbeat in Hadoop?

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Explain the difference between an inputsplit and a block?

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What are the different commands used to startup and shutdown Hadoop daemons?

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What are the side data distribution techniques?

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Explain edge nodes in hadoop?

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