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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…

DevOps: How it Speeds up Delivery

The DevOps is basically a Software development system and most popular in Cloud computing. On-device software and storage may not be passe just yet, but it’s getting there, as more and more computing processes are taking place in the cloud. 


Many companies are also preferring distributed computing, which allows multiple computers to network with one another to solve a task (and, unlike the cloud, gives companies control over the actual hardware involved).


Many of the skills involved with cloud computing and distributed computing are related, so the two are often grouped together:



Skills to learn include SQL for database management, programming languages like Ruby, JavaScript, and Python for building cloud-based applications, and DevOps (a software development system popular in the cloud computing field). Specific in-demand programs include Microsoft Azure and Amazon Web Services.



Also Read: 2017 Fast Growing IT Skills

For instance, Agile, Scrum, Continuous Integration, Test-Driven Development (TDD), Behavior-Driven Development (BDD) and Kanban were some of the top-rated processes and methodologies


The other related skill is Cloud computing - Cloud computing platform, Microsoft Azure, and competitor, Amazon Web Services, ranked second and third respectively in terms of seeing the biggest surge in interest from employers.


Other top gaining skills included Office 365, Infrastructure as a Service (IaaS), Software as a Service (SaaS) and Platform as a Service (PaaS).


Also Read: Learn Cloud computing with AWS

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