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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…

3 Best Ways to Learn AWS on Weekends

Amazon web services are one of the popular skills. So, many developers started adding this skill to their list.  Due to digital transformation, companies started giving more weightage to the developers who have AWS skills.

How to Learn AWS

I want to share in this post how to learn AWS quickly.  The idea is to use your weekends to learn AWS.  My learning plan to allocate 5 hours a week. You can take out 2 hours  Saturday and 3 hours Sunday time for this learning.



 As I said in my previous post basic interview questions on Amazon web services really a quick start.


3 Best Ways to Learn AWS During Weekends.

What is next how to start learning and be industry-ready. You need to have a good laptop to begin your learning. If it is Ubuntu pre-installed one, really this is good for your study and practices...


What materials online you need to refer to. This is basically a question for the developer. Just begin with AWS manuals published by AWS-Amazon web services.


1. AWS manuals or materials.

These you can refer are as follows


Then, manuals are looked heavy with details. This is a little complex to understand as a beginner.


What next...


2. Read books.

Yes, reading AWS books and DevOps really a basic start to gain knowledge.


I am sure the below list of books useful for AWS learners.

The next best option is... 

3. Amazon web services Online.

You can save your time with the online courses.  All the commands you can learn quickly.  They also help you with what to read next.


Our recommended and best selling video courses on amazon web services are as follows.


The list may be short but these are value courses...

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