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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 ?

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


How to run HDInsight Hadoop on windows for data analysis

How to run HDInsight Hadoop on windows for data analysis
#How to run HDInsight Hadoop on windows for data analysis :
HDInsight is Microsoft's implementation of a Big Data solution with Apache Hadoop at its core. HDInsight is 100 percent compatible with Apache Hadoop and is built on open source components in conjunction with Hortonworks, a company focused toward getting Hadoop adopted on the Windows platform.

Basically, Microsoft has taken the open source Hadoop project, added the functionalities needed to make it compatible with Windows (because Hadoop is based on Linux), and submitted the project back to the community. All of the components are retested in typical scenarios to ensure that they work together correctly and that there are no versioning or compatibility issues.

Microsoft's Hadoop-based distribution brings the robustness, manageability, and simplicity of Windows to the Hadoop environment. The focus is on hardening security through integration with Active Directory, thus making it enterprise ready, simplifying manageability through integration with System Center 2012, and dramatically reducing the time required to set up and deploy via simplified packaging and configuration.

These improvements will enable IT to apply consistent security policies across Hadoop clusters and manage them from a single pane of glass on System Center 2012. Further, Microsoft SQL Server and its powerful BI suite can be leveraged to apply analytics and generate interactive business intelligence reports, all under the same roof. For the Hadoop-based service on Windows Azure, Microsoft has further lowered the barrier to deployment by enabling the seamless setup and configuration of Hadoop clusters through an easy-to-use, web-based portal and offering Infrastructure as a Service (IaaS).

Microsoft is currently the only company offering scalable Big Data solutions in the cloud and for on-premises use. These solutions are all built on a common Microsoft Data Platform with familiar and powerful BI tools.

HDInsight is available in two flavors:

Windows Azure HDInsight Service: This is a service available to Windows Azure subscribers that uses Windows Azure clusters and integrates with Windows Azure storage. An Open Database Connectivity (ODBC) driver is available to connect the output from HDInsight queries to data analysis tools.
  • Windows Azure HDInsight Emulator: This is a single-node, single-box product that you can install on Windows Server 2012, or in your Hyper-V virtual machines. 
  • The purpose of the emulator is to provide a development environment for use in testing and evaluating your solution before deploying it to the cloud. You save money by not paying for Azure hosting until after your solution is developed and tested and ready to run. The emulator is available for free and will continue to be a single-node offering.


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