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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…

5 Key Features of SAP HANA IoT

SAP this week pulled the curtain back on a version of its HANA cloud platform tailored specifically to the Internet of Things applications.

The company said the private cloud service, based on its in-memory computing platform HANA, will provide the foundation for its IoT application services – analytics, telematics, its connected car services, and manufacturing offerings.


SAP hasn’t commented on whether it will open up the platform for non-SAP applications. But the company said the move means it now offers an end-to-end spectrum of IoT services.

SAP is helping customers re imagine their business with the most comprehensive portfolio of the Internet of Things solutions from core business operations to the edge of the network.

SAP HANA in IoT Key Features
  1. With the launch of SAP HANA Cloud Platform for the Internet of Things, our customers and partners now have the ability to connect anything to any app or business process in their company and business network.
  2. This will achieve operational excellence and deliver new customer experiences, products, and services,” Lucas said.
  3. As a sweetener the company will throw in free and unlimited access (for a limited time) to SAP SQL Anywhere, the SAP’s embeddable database for IoT devices, when customers sign up to use the HANA Cloud IoT service. Siemens and Tennant are already running production deployments on the platform.
  4. Paul Wellman, chief information officer at Tennant said, Using SAP HANA, Tennant is able to differentiate its solutions and remain competitive in the cleaning equipment business.
  5. Now our customers can measure usage across their fleet to drive operational consistency, track machines to better manage assets and leverage this business intelligence to achieve significant cost savings.
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