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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…

Skills Need Every Employee By 2020

With all the predictions about the future of work, we are constantly painting a picture of how the future workplace will look. But, what most of us should focus on is what the workforce will need to look like – meaning, what skills employees need to have to ensure continued success into the next decade?
The Top 10 Online Colleges website has the answer. They’ve done the research and compiled a list of skills that all employees will need by 2020 (which is only six years away!) and the drivers of the new skill set.
First, we must understand what is driving change and molding the future of work.
The six key drivers of change include:
  1. Extreme longevity: People are living longer.
  2. The rise of smart machines and systems: Tech will augment and extend our own capabilities.
  3. Computational world: There will be an increase in sensors and processing that will make the world a programmable system.
  4. New media ecology: There will be new communication tools that will require media literacies beyond text.
  5. Superstructured organizations: Social technologies will drive new forms of production and value creation.
  6. Globally connected world: Diversity and adaptability will be at the center of operations.

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