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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…
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New IT Job Roles So Popular to Read

The popular job roles you can read today. These are new in the industry. Knowing is not harmful. You will get ideas on achieving these roles.

E-Commerce Business Analyst

It involves supporting the development of e-commerce solutions. This person should possess strong analytical, organizational and communication skills and will have demonstrated the ability to collaborate within a team environment.

Virtualization Engineer/Architect

It refers to the agile provisioning of converged storage, computes and network resources. It requires knowledge of how to take a cluster of physical servers and make them virtual machines, it also extends to network and storage virtualization

CRM Expert

Customer Relationship Management (CRM) experts need to work on complex CRM applications and their role includes programming, project management, project development, systems configuration, and development. Read more

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