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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…
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Cloud Computing learn quickly top Terminology you need

Cloud computing is a big ocean. Due to increased services, a developer must know handy about all the glossary or keywords involved.

Glossary Cloud Computing

1) AWS
Amazon Web services

2) Content delivery network (CDN)
It is a distributed system. Servers are located in remote locations. Customers feel that they are accessing the servers by.

3) Cloud
A global network to access the resources.

4) Cloud portability
The feature to move data from one Cloud provider to another provider.

5)Cloudsourcing
Moving traditional IT operations to Cloud computing.

6) Cloud storage
It is a service providing to users to store data using the internet or other private networks.

7) Cloudware
It is a Software that helps to run user applications in cloud computing.

8) Cluster
A group of small computers connected together to form a Single big computer. High availability and load balancing are the main benefits.

9) Consumer cloud
The cloud provider offers service to individual users. You can call it as consumer cloud.

10) Consumption-based pricing model
Cloud computing users must pay some fees to the cloud provides. This fee is based on consumption but not on time-based.

11) Content Management Interoperability Services (CMIS)
An open standard to control documents using web protocols

12) Customer self-service
This is a feature that user can manage cloud computing services using Web Services or APIs.

13) Disruptive technology
Technology with innovative methods and offers benefits to users.

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