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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 ?


A. In HDFS
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




Question…

Career Opportunities in Mobile App Development

Mobile application development one of the hot skills in the digital age. The use of mobile phones and the internet create many job opportunities in the area of mobile application development. The following skill set is required to enter into mobile application development.

mobile apps career path

Mobile Development Career Paths

  1. Applications development in multiple platforms
  2. User interfaces design for mobile apps
  3. Marketing for apps which already developed

#1  Development Career

The opportunities are more to develop mobile applications. There are a lot of creative opportunities you can find in this career path. 

You will get a chance to develop applications for Android, IoS, and Windows.
Nowadays the apps are intelligent and smart. The smartness means those should have user-friendly to the end-users.

#2  User Interface Design

The UX or user experience for mobile apps very much needed to be a successful app. The popularity of an app directly related to how well it is designed.

Best applications generate revenues for the owners and jobs are created for continuous improvement.

 #3 Marketing of Apps

Skill in marketing very much needed to generate revenues to the owner.  Develop once and sell it to multiple owners generates revenues. Your career progress depends on the level of your marketing skill. The marketing skill you gained makes you earn more once you start selling apps.

The marketing section has multiple roles. They slowly can move into an advertisement for that mobile app.

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