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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 ?

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


Industrial IoT what GE says to improve Productivity

GE is once a top company in Heavy Engineering. This is to say items related to Thermal Power plants, Turbines, and maintenance.

GE had always believed that since it knew the materials and the physics of its jet engines and medical scanners, no one could best it in understanding those machines.

GE Industrial Internet

 The aim is it should not share its data to third parties.
  1.    GE sets up its own IoT center.
  2.    GE is in IoT mood.
  3.    GE can improve operational efficiency by studying data from its machines like situated India and Russia. This is just an example.
Asset classification in analytics

 GE is Targetting for Predictive Maintenace

  • Improves industrial productivity
  • Based on criticality productivity will zoom if maintenance carried in-time.


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