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

729

---

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?

766

---

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

724

---

Give some points of pig for hadoop ?

588

---

How does master slave architecture in the hadoop?

884

---

Explain the wordcount implementation via hadoop framework ?

765

---

What is hadoop framework?

765

---

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

710

---

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

659

---

How to enable recycle bin in hadoop?

800

---

How to enable trash/recycle bin in hadoop?

778

---

What is small file problem in hadoop?

833

---

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

738

---

What exactly is hadoop?

732

---

Can we do online transactions(oltp) using hadoop?

711

---