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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…

4 Popular Cloud Computing Applications

Data Storage and Backup Box.com, Mozy, Joukuu are the applications offering data storage and backup services in cloud.

Box.com offers drag and drop service for files. It just required to drop the files into Box and access from anywhere. 

Mozy offers online backup service for files during a data loss.

1. Business Applications

  • MailChimp - It offers an e-mail publishing platform. It is widely employed by the businesses to design and send their e-mail campaigns. 
  • Chatter - Chatter app helps the employee to share important information about organization in real time. One can get the instant feed regarding any issue. 
  • Google Apps - for Business Google offers creating text documents, spreadsheets, presentations, etc., on Google Docswhich allows the business users to share them in collaborating manner. 
  • Quickbooks - It offers online accounting solutions for a business. It helps in monitoring cash flow, creating VAT returns and creating business reports.

2. Management Applications

There are apps available for management task such as time tracking, organizing notes. Applications performing such tasks are discussed below: SN Application Description.
  1. Toggl-  It helps in tracking time period assigned to a particular project.
  2. Evernote- Evernote is an application that organizes the sticky notes and even can read the text from images which helps the user to locate the notes easily.
  3. Outright-  It is an accounting app. It helps to track income, expenses, profits and losses in real time.

3. Social Applications

There are several social networking services providing websites such as Facebook, Twitter, etc. SN Application Description

1 Facebook- Facebook offers social networking service. One can share photos, videos, files, status and much more.

2 Twitter- Twitter helps to interact directly with the public. One can follow any celebrity, organization and any person, who is on twitter and can have latest updates regarding the same.

Entertainment Applications

4. SN Application Description

  • Audiobox.fm - It offers streaming service, i.e., music can be stored online and can be played from cloud using service's own media player.
  • Art Applications 
  • Moo-  It offers art services such as designing and printing business cards, postcards and minicards.

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