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

616

---

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?

672

---

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

591

---

Give some points of pig for hadoop ?

516

---

How does master slave architecture in the hadoop?

759

---

Explain the wordcount implementation via hadoop framework ?

674

---

What is hadoop framework?

666

---

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

629

---

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

581

---

How to enable recycle bin in hadoop?

715

---

How to enable trash/recycle bin in hadoop?

688

---

What is small file problem in hadoop?

719

---

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

644

---

What exactly is hadoop?

646

---

Can we do online transactions(oltp) using hadoop?

624

---