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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…

SMAC-Persistent Systems

The global leader in software product and technology services, today announced it has entered into a definitive agreement to acquire privately-held CloudSquads, an innovative consultancy that has created social communities for over 70 global companies. CloudSquads deploys, integrates and runs social communities on all leading social customer platforms.  Terms of the agreement were not disclosed and are subject to certain closing conditions which are expected to be completed in the coming financial quarter.

According to Forrester Research Senior Analyst, Kim Celestre in her July 9, 2013 blog post entitled Just Published: The Forrester WAVE: Social Depth Platforms, Q3 2013, “Social media has transformed the way that buyers discover, explore, and engage with a brand. As a result, many marketers have invested in establishing a presence on popular social networks like Facebook and Twitter yet are struggling with how to convert interactions on these social networks to a purchase.”
CloudSquads helps companies develop a strategy for engaging with the modern social customer across all customer facing functions including brand, marketing, sales and support.  The company implements platforms which provide rich capabilities that transform these interactions into healthy communities and then integrates those platforms with companies’ internal systems allowing them to better know and serve their customers.
“Social Communities are now an increasingly critical part of the digital transformation in enterprises, and this market is poised for significant growth. Persistent Systems is delighted to welcome on board the entire CloudSquads’ team of social computing domain and technology specialists,” said Ranga Puranik, President, Persistent Systems, Inc. “CloudSquads complements our software product development and SMAC (Social, Mobile, Analytics, Cloud) technology expertise with consulting, IP connectors and implementation services around social community platforms and is perfectly aligned to better serve our ISV and enterprise customer base.”

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