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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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Top Teradata Course details that you need to learn

Teradata is most popular database among data warehousing projects. You will learn Teradata from any institute you want. My post intention is you just take a look on course contents you need to learn.
course contents

Course Contents You Need to Look Before You Start

Introduction to Teradata

  • Data warehousing concepts and SCD’s
  • OLTP & OLAP
  • Teradata Architecture & Physical Design
  • Teradata Vs. Other RDBMS
  • BYNETPEs
  • AMPs
  • Vprocs
  • Clique
  • Cluster
  • Data Storage
  • Data Distribution
  • Data Access
  • Teradata Space Management

Fault Tolerance

  • Data Protection

Teradata Indexes and Performance Tuning and Optimization

  • UPI – Unique Primary Index
  • NUPI – Non Unique Primary Index
  • USI – Unique Secondary Index
  • NUSI – Non Unique Secondary Index
  • PPI – Partition Primary Index
  • MLPPI – Multilevel Partition Primary Index
  • STJI – Single Table Join Index
  • MTJI – Multi Table Join Index
  • AJI – Aggregate Join Index
  • Global Temporary Tables and Volatile Temporary Tables
  • Different Types of Tables in Teradata RDBMS
  • Performance Tuning
  • Explain Plan

Teradata Application Utilities

  • Real-time hands-on Query Man / SQL Assistance

Teradata Application Utilities

  • BTEQ
  • FastExport
  • FastLoad
  • MultiLoad
  • TPump
  • Teradata Parallel Transporter (TPT)
  • High Level Design of DWH Architecture from customer request to SDLC
Finally, the above list, trust me, it is complete list. I am sure if you do some project, it is good you will get job easily.

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