Answer / Gopal Prasad Poddar

The main daemons that run on master nodes in Hadoop are: NameNode (in classic Hadoop), JobTracker (in MapReduce 1), and ResourceManager (in YARN). These daemons manage the file system, jobs, and resources respectively.

Ideally what should be the replication factor in hadoop?

1 Answers  

---

What is job tracker in Hadoop?

1 Answers  

---

How to do ‘map’ and ‘reduce’ works?

1 Answers  

---

What does rack awareness mean?

1 Answers  

---

What is the non dfs used?

1 Answers  

---

What happen if one of the datanodes has much slower cpu?

1 Answers  

---

Why would nosql be better than using a sql database? And how much better is it?

1 Answers  

---

What are 'slaves' and 'masters' in Hadoop?

1 Answers  

---

What are the side data distribution techniques?

1 Answers  

---

Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?

1 Answers  

---

What kind of hardware is best for hadoop?

1 Answers  

---

Can hadoop replace relational database?

1 Answers  

---