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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…

Information Architect Key Responsibilities

Gartner defines "enterprise information architecture" as that part of the enterprise architecture process.

It is a set of requirements, principles and models — the current state, future state, and guidance necessary to flexibly share and exchange information assets to achieve effective enterprise change. 

Enterprise information Architect also called EIA.

Information Architecture 

The transition from information that is isolated within applications to a flexible, comprehensive enterprise information architecture will require changes in technology, process, organizational structure and orientation. 

In particular, EA practitioners comfortable with technical architecture must now devote time to understanding this emerging discipline. 

Gartner projects that, EA teams will be forced by the business to spend as much time on information architecture as they currently spend on technical architecture. 

Changes will also impact a range of disciplines across the organization and will require coordination to drive efficiencies and achieve objectives. 

What is the role of architect

To participate in the organization's desire to maximize the value and effectiveness of information assets include: 

#1: Architects (including solution architects) Application designers Data modelers Database administrators Business intelligence specialists Master data management specialists.

#2: Data quality specialists Data integration specialists Metadata management specialists Business analysts Content management specialists Professionals in security, compliance, privacy and related disciplines 

#3: Some of these roles will be done concurrently, depending on the size of the teams, the rules of engagement (that is, "who does what at which point in the activity cycle"), the depth of domain knowledge, and resource availability. 

Understanding the different roles impacted by EIA is a critical first step. 

Role of Enterprise Architecture The role of enterprise architects is to act as facilitator, planner, change agent, champion and coach during these activities (but never dictator).

Summary

Their job is to advocate the adoption and assurance of all enterprise architecture deliverable. 

Enterprise architects should be well equipped to handle this challenge, because of their strong relationships with the business and their strategic planning skills. 

However, some will need to retool their skills. Those who step in, and step up, to develop an EIA will help their organizations deliver new enterprise capabilities

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