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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 Case Study Part-2

Present case study is in Health Care:
 
Practo Technologies was formed in year 2008. The vision of the company was to make medical information digitally accessible to patients and doctors. With all these features at pleasing price, solutions providers like Practo aimed to create the most efficient healthcare experience for people in India and gradually around the world.


The aim was to improve the patient experience for finding and meeting a doctor.

 
Traditionally the healthcare records were created manually and stored on shelves. Managing of records stored in files traditionally was of not much use. With the evolution of technology, there has been a paradigm shift in the manner the healthcare industry functions.
 
The medical records are electronically stored and managed. With the acceptance of cloud computing the healthcare patient data is stored at a remote server location on the internet.
 
The following companies offering CLOUD based health care Service:
 
Practo Ray
 
It is a cloud based flagship product that allows patients to search for doctors and book their appointment online. The dedicated online platform for health professionals and intelligent system that lets users know when the doctor is available. The user friendly and effective practice management software supports online appointment booking, electronic medical records (EMR) and enables effective clinic-patient communication.
Practo Hello:
 
It is the first automated call based software that enables patients to call and book their appointment instantly. The automated voice service responds to the calls made by the patients to book an appointment. The Interactive Voice Response System (IVRS) solution for doctors lets them manage the phone calls made to their clinics and access call recordings while ensuring that no call goes unanswered.
Practo Group
 
It is an online collaborative platform dedicated to healthcare community. The online forum enables healthcare professionals to share views, meet other members and promote their health events. The group service enabled collaboration among like-minded healthcare fraternity.

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