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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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Dynamics of "Code Halos" in the age Digital world

[IoT -Code Halos Career]
[IoT -Code Halos Career]
“Code Halos – the information that surrounds people, organizations, and devices – are today's digital fuel. Every click, swipe, and view, every interaction and transaction generates a halo of code – a "virtual self" – that's robust, powerful, and rich with meaning and insight. You can go with an excellent book on Code halos.

Code Halos are a given in our personal lives; however, they are increasingly vital to every organization's future business success.” Research conducted by Cognizant's Center for the Future of Work reveals that organizations that create, share, and distill meaning from Code Halos are dominating their industries.
The dynamics of Code Halos is realized in our ever-increasing daily interactions across the web like social media, e-commerce, file sharing, smartphone apps, and other computing devices.

Moreover there are multiple layers of interdependencies between each of these interactions that create a unique virtual identity termed by Cognizant as Code Halos. Accordingly, it is a halo of digital information connecting people, organizations, processes, and devices.

Extending the Code Halos idea to other meaningful data at the enterprise level unravels some interesting examples: Insurance companies Allstate and Progressive and others are using very specific driver data, collected in many cases through telematics devices, to create new kinds of commercial models for personal and auto insurance.

Read more: Internet of things-part-6

Disney has created its MagicBand system where it has encoded user credit card information and what kind of things consumers are interested in; it helps users get a very personalized theme-park guest experience based on data and information, and it’s all encoded in a wristband. In manufacturing, GE creates code halos around their jet engine with hundreds of sensors built into the engine, generating data useful for GE and airlines. It’s lowering costs, improving safety, and efficiency, and there are many business benefits.

Read more: Code Halos -How digital lives of people changing the world.

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