Hadoop Interview Questions and Answers

Ques 31. What do you know by storage and compute node?

Storage node: Storage Node is the machine or computer where your file system resides to store the processing data.

Compute Node: Compute Node is a machine or computer where your actual business logic will be executed.

Ques 32. Is it necessary to know Java to learn Hadoop?

If you have a background in any programming language like C, C++, PHP, Python, Java, etc. It may be really helpful, but if you are nil in java, it is necessary to learn Java and also get the basic knowledge of SQL.

Ques 33. How to debug Hadoop code?

There are many ways to debug Hadoop codes but the most popular methods are:

• By using Counters.
• By web interface provided by the Hadoop framework.

Ques 34. Is it possible to provide multiple inputs to Hadoop? If yes, explain.

Yes, It is possible. The input format class provides methods to insert multiple directories as input to a Hadoop job.

Ques 35. What is the relation between job and task in Hadoop?

In Hadoop, A job is divided into multiple small parts known as the task.