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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


Python: Libraries You Need to Create ML Model

To Create a Model of Machine Learning in Python, you need TWO libraries. One is 'NUMPY' and the other one is 'PANDAS'.

Libraries You Need to Create ML Model

Two Top Libraries You Need

1: NUMPY - It has the capabilities of Calculations.

2: PANDAS- It has the capabilities of Data processing.
To Build a model of Machine learning you need the right kind of data. So, to use data for your project, the Data should be refined. Else, it will not give accurate results. The key steps are Data Analysis and Data Preprocessing.

Command to Install Machine Learning Libraries in Python

import numpy as np # linear algebra
import pandas as pd # data processing, CSV file I/O (e.g. pd.read_csv)

How to Check NumPy/Pandas installed

After '.' you need to give double underscore on both the sides of the version. 
how to check numpy or pandas version

How Many Types of Data You Need

You need two types of data. One is data to build a model and the other one is data you need to test the model.
  1. Raw data
  2. Evaluate-data

How to Build a Model Flowchart

I have given a flowchart to build a model along with sample data.

  1. Sample ML Model Project using Python


  1. Big data solutions developer should understand the need of Data, and they should work to build more appropriate services to meet the requirements of their clients.


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