Describe what happens to a mapreduce job from submission to output?

663

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If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

710

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What are mapreduce new and old apis while writing map reduce program?. Explain how it works

643

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Give some points of pig for hadoop ?

555

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How does master slave architecture in the hadoop?

813

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Explain the wordcount implementation via hadoop framework ?

722

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What is hadoop framework?

716

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What is partioner in hadoop? Where does it run,mapper or reducer?

669

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What is a task instance in hadoop? Where does it run?

612

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How to enable recycle bin in hadoop?

755

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How to enable trash/recycle bin in hadoop?

735

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What is small file problem in hadoop?

777

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What are the default configuration files that are used in hadoop?

689

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What exactly is hadoop?

689

---

Can we do online transactions(oltp) using hadoop?

667

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