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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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KYC: Top BlockChain Application Read Today

SBI is now pressing ahead with its first implementation of the decentralized technology by using an enterprise blockchain solution for managing its Know Your Customer (KYC) system, via a new partnership with Intel that sees the technology giant become the consortium’s official technology advisor. 

BlockChain KYC

What is KYC

  1.  Know your customer means all banks update information about their customers
  2. Customer details are like Phone number, Aadhar Card, PAN, and Home Address, etc.
  3. These details mandatory to update once in six months.

Blockchain Platform to Use in KYC is Hyperledger Sawtooth

  • The enterprise blockchain will run on Hyperledger Sawtooth, a modular platform for developing and deploying blockchains, developed by Intel – a member of the open-source Linux Foundation-led Hyperledger project. The blockchain will also be supplemented by Intel Software Guard Extensions (SGX) to boost the blockchain’s privacy, security, and scalability.
  • The blockchain solution will be delivered by Primechain, an Indian blockchain startup powering the Bankchain consortium.BlockChain applications
  • The solution will help SBI to increase the efficiency of financial transactions without having to compromise on data confidentiality and transaction security.
  • Intel SGX can improve blockchain privacy, security, and scalability while Hyperledger Sawtooth is open source and takes advantage of silicon features like Intel SGX to deliver a blockchain application platform.

Blockchain Technology

Blockchain is an emerging technology that has the potential benefits to transform traditional business processes and the ways in which data is exchanged by consumers and financial institutions.

Blockchain eliminates the need for intermediaries, improving business efficiency, and reducing cost and transaction complexity.

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