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Prepared by Eng :Ahmed Shalash

Hadoop Lecture 0
by

ahmed shalash

on 17 February 2015

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Transcript of Prepared by Eng :Ahmed Shalash

Slides based on original course by UDACITY
Prepared by Eng :Ahmed Shalash
what is data ?
Data is a collection of facts, such as numbers, words, measurements, observations or even just descriptions of things.
Data
what is information ?


information
Data that is (1) accurate and timely, (2) specific and organized for a purpose, (3) presented within a context that gives it meaning and relevance, and (4) can lead to an increase in understanding and decrease in uncertainty.

Information
what is big data ?
Data that can’t be processed in a single machine.
Big Data

data is created fast
data from different sources in various formats
Challenges for big data
3 V
volume
velocity
variety
Hadoop
what is hadoop
hadoop stores data in hdfs
what is HDFS
what is map reduce ?
it is the processing function
Full transcript