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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…

Cloud Security rules top book to read it now

The Cloud Security Rules explains the different aspects of cloud security to business leaders, CxO's, IT-managers and decision makers. The security principles are the same as before while the implementation and the risks involved are dramatically changed.

cloud security

The book is co-authored by some of the most recognized security specialists and bloggers in the world. The authors are gathered from USA, Europe and Africa, sharing their great knowledge of implementing and securing the cloud.

This book is made to help it easier for you to choose the right cloud supplier as well as setting up and running your critical services in the cloud.

1. Questions you will find answers about include

Do I have to accept that standard SLA?

What should an SLA include?

What standards should I be paying attention to, if any?

How do I treat mobile workers, and how do they fit into the cloud?

Do I really need to care about logging?

2. Other Stuff You Will Learn


Many more! Since the cloud computing is global, you risk using service providers in other countries than your own - even if you only operate in your own country. The Cloud Security Rules aims at helping you understand the risks involved, and help you determine the best strategy for your organization.

References

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