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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…

Top Differences Read Today Agile vs Waterfall model

The Agile and Waterfall both models are popular in Software development. The Agile model is so flexible compared to waterfall model. Top differences on Waterfall vs Agile give you clear understanding on both the processes.

Waterfall Model

  • The traditional model is waterfall. It has less flexibility.
  • Expensive and time consuming model.
  • Less scalable to meet the demand of customer requirements.
  • The approach is top down. Starting from requirements one has to finish all the stages, till deployment to complete one cycle.
  • A small change in requirement, one has to follow all the stages till deployment.
  • Waterfall model creates idleness in resource management.
agile vs waterfall differences

Agile Model

  • Agile model is excellent for rapid deployment of small changes
  • The small split-requirements you can call them as sprints
  • Less idleness in resource management.
  • Scope for complete team involvement.
  • Faster delivery makes client happy.
  • You can deploy changes related to compliance or regulatory quickly.
  • Collaboration improves among the team.

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