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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


The Robotics career top skills that you need always

The following skills are required to enter into Robotic Career.

  • Matlab - Familiarity with command-line and external functions using MATLAB library; mport/export of data; graphing/plotting functions & data; rudimentary animation
  • Python- And / or C / C++ familiarity
  • ROS- Robot Operating System (ROS) - Optional (Good to know)
  • Program Constructs- Sequencing, Selection, Iteration & Recursion
  • Data Organization- Arrays, Lists, Pointers
COMPUTERS: Tools Productivity : SW (MS Office - Excel / Word / PowerPoint / Project)

Operating Systems: Windows or Apple-OS - use of personal laptop computer Linux or Ubuntu

  • Linear Algebra Inversion, Eigenvalues, Null-Space
  • Linear Differential Eq. Matrix-Algebra & -Manipulation
  • Basic Calculus Derivatives, Gradients, Chain Rule
  • Numerical Integration Basic Computational Implementation, e.g. Runge-Kutta 4
  • Fourier Analysis NOT how to calculate the coefficients, but the notion that any complicated fct. can be represented as a composite of simpler ones
PHYSICS: Newtonian Physics- Newton-Euler Mechanics (Forces, torques, mass / inertia, Equations of motion) System State Degrees of Freedom & Constraints to fully describe a system’s behavior mathematically

CONTROLS: Control Systems, Controls Fundamentals (transfer functions; bode plots; stability-margin; time-response of LTI systems; PID compensators)

Basic Electronics: Electronics- Basic experience with practical circuits (elements, interactions, PCBs) Mechanisms- Some design and fabrication experience (Concept -> CAD -> Fabrication)
Documentation -Basic skills in document structuring and technical writing.


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