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The Ultimate Cheat Sheet On Hadoop

Top 20 frequently asked questions to test your Hadoop knowledge given in the below Hadoop cheat sheet. Try finding your own answers and match the answers given here.

Question #1 

You have written a MapReduce job that will process 500 million input records and generate 500 million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reducers which is a potential bottleneck. A custom implementation of which of the following interfaces is most likely to reduce the amount of intermediate data transferred across the network?

A. Writable
B. WritableComparable
C. InputFormat
D. OutputFormat
E. Combiner
F. Partitioner
Ans: e

Question #2 

Where is Hive metastore stored by default ?

B. In client machine in the form of a flat file.
C. In client machine in a derby database
D. In lib directory of HADOOP_HOME, and requires HADOOP_CLASSPATH to be modified.
Ans: c


5 Top Future Learning Digital Skills to Perform Your Job

Before you perform work in a new-age digital job, focus on the real skills you need to learn.
real digital skills

1. Automate Repeated Tasks

  • Take the best example of saving all the emails from google account. That is after sending an email that should save in an Excel document.
  • This is one kind of Skill. So learning technologies to create Tools for this kind of automation provide you a lot of job opportunities.

2. Automate Stop Function

For example, work and home both are different. After certain hours the access to the Company network should be stopped. So that you can focus on your Home duties. Here you should have tools to do this kind of activity.

3. Data visualization

How to present data in a user-friendly way is the topmost digital skill. Nowadays there are many tools present. The Best example is Tableau. You can present the data in a user-friendly way.

4. Working Ability in Cloud Environment

For example, the olden days' servers are complex to migrate and move from one area to another. Cloud computing helps you to ease your job. You can move anywhere easily across the globe. Cloud servers really helpful. Learning Cloud computing shows a better career.

5. Ability to Use Modern Communication Channels

You can use Smart Phones, Social media, WhatsUp, Video conference, Voice calls, Internet-connected phones, to communicate with remote clients. You need to know how to use all these channels.

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