Date post: | 08-Jan-2017 |
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Agenda
●What is big data?●Data at rest Vs Data in motion●Batch processing Vs Real - time data
processing (streaming)●Examples●When to use: Batch? Real-time? ●Current trends
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Image ref [4]
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Big data
Exploding sizes of datasets4
●Google ○>100PB data everyday [3]
●Large Hydron collidor : ○150M sensors x 40M sample per sec x 600
M collisions per sec○>500 exabytes per day [2]○0.0001% of data is actually analysed
Data at rest Vs Data in motion
● At rest : ○ Dataset is fixed ○ a.k.a bounded [15]
● In motion : ○ continuously incoming data ○ a.k.a unbounded
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Data at rest Vs Data in motion (continued)
●Generally Big data has velocity○continuous data
●Difference lies in when are you analyzing your data? [5]
○after the event occurs ⇒ at rest○as the event occurs ⇒ in motion
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Examples
●Data at rest○Finding stats about group in a closed room○Analyzing sales data for last month to make
strategic decisions●Data in motion
○Finding stats about group in a marathon○e-commerce order processing
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Batch processing
●Problem statement : ○Process this entire data ○give answer for X at the end.
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Batch processing : Use-cases9
● Sales summary for the previous month[5]
● Model training for Spam emails
Batch processing : Characteristics10
●Access to entire data●Split decided at the launch time.●Capable of doing complex analysis (e.g.
Model training) [6]●Optimize for Throughput (data processed
per sec) ●Example frameworks : Map Reduce,
Apache Spark [6]
Real time data processing
● a.k.a. Stream processing● Problem statement :
○ Process incoming stream of data ○ to give answer for X at this
moment.
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Stream processing : Use-cases
● e-commerce order processing● Credit card fraud detection● Label given email as : spam vs non-
spam
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Image ref [7]
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Stream processing : Characteristics
● Results for X are based on the current data
● Computes function on one record or smaller window. [6]
● Optimizations for latency (avg. time taken for a record)
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Stream processing : Characteristics
●Need to complete computes in near real-time
●Computes something relatively simple e.g. Using pre-defined model to label a record.
●Example frameworks: Apache Apex, Apache storm
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Batch Vs Streaming
pani puri Streaming⇒image ref [9]
wada batch ⇒image ref [8]
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Micro-batch●Create batch of
small size ●Process each
micro-batch separately
●Example frameworks: Spark streaming
pani puri micro-batch⇒ image ref [10]
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● Depends on use-case○Some are suitable for batch○Some are suitable for streaming○Some can be solved by any one○Some might need combination of two.
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When to use : Batch Vs Streaming?
When to use : Batch Vs Real time?(continued) ●Answers for current snapshot Real-⇒
time○Answers at the end Open⇒
●Complex calculations, multiple iterations over entire data Batch ⇒○Simple computations Open⇒
●Low latency requirements (< 1s) Real-⇒time
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When to use : Batch Vs Real time?(continued)
●Each record can be processed independently Open⇒○Independent processing not possible ⇒
Batch● Depends on use-case
○Some use-cases can be solved by any one○Some other might need combination of two.
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Can one replace the other?
●Batch processing is designed for ‘data at rest’. ‘data in motion’ becomes stale; if processed in batch mode.
●Real-time processing is designed for ‘data in motion’. But, can be used for ‘data at rest’ as well (in many cases).
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Quiz : is this Batch or Real-time?
●Queue for roller coaster ride image ref [11]
●Queue at the petrol pump image ref [12]
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Quiz : is this Batch or Real-time?
●Selecting relevant ad to show for requested page
●Courier dispatch from city A to B
image ref [13]
image ref [14]
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Current trends●Difficulty in splitting problems as Map
Reduce : Alternative paradigms for expressing user intent .
●More and more use-cases demanding faster insight to data (near real-time)
●‘Data in motion’ is common. ●‘Real-time data processing’ getting
traction.
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Questions
Image ref [16]
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References1. Big Data | Gartner IT Glossary http://www.gartner.com/it-glossary/big-data/2. Big Data | Wikipedia https://en.wikipedia.org/wiki/Big_data 3. Data size estimates | Follow the data https://followthedata.wordpress.com/2014/06/24/data-size-estimates/4. Data Never Sleeps 2.0 | Domo https://www.domo.com/blog/2014/04/data-never-sleeps-2-0/5. Data in motion vs. data at rest | Internap http://www.internap.com/2013/06/20/data-in-motion-vs-data-at-rest/6. Difference between batch processing and stream processing | Quora https://www.quora.com/What-are-the-differences-between-batch-
processing-and-stream-processing-systems/answer/Sean-Owen?srid=O9ht7. How FAST is Credit Card Fraud Detection | FICO http://www.fico.com/en/latest-thinking/infographic/how-fast-is-credit-card-fraud-
detection8. CULINARY TERMS | panjakhada http://panjakhada.com/the-basics/9. Crispy Chaat ... | grabhouse http://grabhouse.com/urbancocktail/11-crispy-chaat-joints-food-lovers-hyderabad/10. Paani puri stall | citiyshor http://www.cityshor.com/pune/food/street-food/camp/murali-paani-puri-stall/11. Great Inventions: The Roller Coaster | findingdulcinea http://www.findingdulcinea.com/features/science/innovations/great-inventions/the-
roller-coaster.html12. RIL petrol pump network | economictimes http://articles.economictimes.indiatimes.com/2015-05-24/news/62583419_1_petrol-and-diesel-
fuel-retailing-ril13. Publishers | Propellerads https://propellerads.com/publishers/14. Michael Bishop Couriers | Google plus https://plus.google.com/11068417651766822306715. The world beyond batch: Streaming 101 http://radar.oreilly.com/2015/08/the-world-beyond-batch-streaming-101.html16. How to Answer the Question http://www.clipartpanda.com/clipart_images/how-to-answer-the-question-4695414617. Thank You http://www.planwallpaper.com/thank-you
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