Large-Scale Analysis of Web Pages
− on a Startup Budget?
Hannes Mühleisen, Web-Based Systems Group
AWS Summit 2012 | Berlin

Our Starting Point
2

Our Starting Point
• Websites now embed structured data in HTML
2

Our Starting Point
• Websites now embed structured data in HTML
• Various Vocabularies possible
• schema.org, Open Graph protocol, ...
2

Our Starting Point
• Websites now embed structured data in HTML
• Various Vocabularies possible
• schema.org, Open Graph protocol, ...
• Various Encoding Formats possible
• μFormats, RDFa, Microdata
2

Our Starting Point
• Websites now embed structured data in HTML
• Various Vocabularies possible
• schema.org, Open Graph protocol, ...
• Various Encoding Formats possible
• μFormats, RDFa, Microdata
Question: How are Vocabularies and Formats used?
2

Web Indices
• To answer our question, we need to access to raw Web data.
3

Web Indices
• To answer our question, we need to access to raw Web data.
• However, maintaining Web indices is insanely expensive
• Re-Crawling, Storage, currently ~50 B pages (Google)
3

Web Indices
• To answer our question, we need to access to raw Web data.
• However, maintaining Web indices is insanely expensive
• Re-Crawling, Storage, currently ~50 B pages (Google)
• Google and Bing have indices, but do not let outsiders in
3

• Non-Profit Organization
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• Non-Profit Organization
• Runs crawler and provides HTML dumps
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• Non-Profit Organization
• Runs crawler and provides HTML dumps
• Available data:
• Index 02-12: 1.7 B URLs (21 TB)
• Index 09/12: 2.8 B URLs (29 TB)
4

• Non-Profit Organization
• Runs crawler and provides HTML dumps
• Available data:
• Index 02-12: 1.7 B URLs (21 TB)
• Index 09/12: 2.8 B URLs (29 TB)
• Available on AWS Public Data Sets
4

Why AWS?
• Now that we have a web crawl, how do we run our analysis?
• Unpacking and DOM-Parsing on 50 TB? (CPU-heavy!)
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Why AWS?
• Now that we have a web crawl, how do we run our analysis?
• Unpacking and DOM-Parsing on 50 TB? (CPU-heavy!)
• Preliminary analysis: 1 GB / hour / CPU possible
• 8-CPU Desktop: 8 months
• 64-CPU Server: 1 month
• 100 8-CPU EC2-Instances: ~ 3 days
5

Common Crawl
Dataset Size

Common Crawl
Dataset Size
1 CPU, 1 h

Common Crawl
Dataset Size
1 CPU, 1 h
1000 € PC, 1 h

Common Crawl
Dataset Size
1 CPU, 1 h
1000 € PC, 1 h
5000 € Server, 1 h

Common Crawl
Dataset Size
1 CPU, 1 h
1000 € PC, 1 h
5000 € Server, 1 h
17 € EC2 Instances, 1 h

AWS Setup
• Data Input: Read Index Splits from S3
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AWS Setup
• Data Input: Read Index Splits from S3
• Job Coordination: SQS Message Queue
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AWS Setup
• Data Input: Read Index Splits from S3
• Job Coordination: SQS Message Queue
• Workers: 100 EC2 Spot Instances (c1.xlarge, ~0.17 € / h)
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AWS Setup
• Data Input: Read Index Splits from S3
• Job Coordination: SQS Message Queue
• Workers: 100 EC2 Spot Instances (c1.xlarge, ~0.17 € / h)
• Result Output: Write to S3
7

AWS Setup
• Data Input: Read Index Splits from S3
• Job Coordination: SQS Message Queue
• Workers: 100 EC2 Spot Instances (c1.xlarge, ~0.17 € / h)
• Result Output: Write to S3
• Logging: SDB
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SQS • Each input file queued in SQS
• EC2 Workers take tasks from SQS
• Workers read and write S3 buckets
42
...
EC2
42 43 ... R42 R43 ...
CC WDC
S3

SQS • Each input file queued in SQS
• EC2 Workers take tasks from SQS
• Workers read and write S3 buckets
42
...
EC2
42 43 ... R42 R43 ...
CC WDC
S3

SQS • Each input file queued in SQS
• EC2 Workers take tasks from SQS
• Workers read and write S3 buckets
42
...
EC2
42 43 ... R42 R43 ...
CC WDC
S3

Results - Types of Data
Microdata 02/2012
RDFa 02/2012 Website Structure 23 %
5e+06
RDFa 2009/2010
Microdata 2009/2010
Products, Reviews 19 %
Entity Count (log)
5e+05
Movies, Music, ... 15 %
5e+04
Geodata 8 %
5e+03
People, Organizations 7 %
0 50 100 150 200 2012 Microdata Breakdown
Type
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Results - Types of Data
Microdata 02/2012
RDFa 02/2012 Website Structure 23 %
5e+06
RDFa 2009/2010
Microdata 2009/2010
Products, Reviews 19 %
Entity Count (log)
5e+05
Movies, Music, ... 15 %
5e+04
Geodata 8 %
5e+03
People, Organizations 7 %
0 50 100 150 200 2012 Microdata Breakdown
Type
• Available data largely determined by major player support
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Results - Types of Data
Microdata 02/2012
RDFa 02/2012 Website Structure 23 %
5e+06
RDFa 2009/2010
Microdata 2009/2010
Products, Reviews 19 %
Entity Count (log)
5e+05
Movies, Music, ... 15 %
5e+04
Geodata 8 %
5e+03
People, Organizations 7 %
0 50 100 150 200 2012 Microdata Breakdown
Type
• Available data largely determined by major player support
• “If Google consumes it, we will publish it”
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Results - Formats
2009/2010
•
4
02−2012
URLs with embedded Data: +6%
Percentage of URLs
3
2
1
0
RDFa Microdata geo hcalendar hcard hreview XFN
Format
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Results - Formats
2009/2010
•
4
02−2012
URLs with embedded Data: +6%
Percentage of URLs
3
• Microdata +14% (schema.org?)
2
1
0
RDFa Microdata geo hcalendar hcard hreview XFN
Format
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Results - Formats
2009/2010
•
4
02−2012
URLs with embedded Data: +6%
Percentage of URLs
3
• Microdata +14% (schema.org?)
2
•
1
RDFa +26% (Facebook?)
0
RDFa Microdata geo hcalendar hcard hreview XFN
Format
10

Results - Extracted Data
• Extracted data available for download at
• www.webdatacommons.org
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Results - Extracted Data
• Extracted data available for download at
• www.webdatacommons.org
• Formats: RDF (~90 GB) and CSV Tables for Microformats (!)
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Results - Extracted Data
• Extracted data available for download at
• www.webdatacommons.org
• Formats: RDF (~90 GB) and CSV Tables for Microformats (!)
• Have a look!
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AWS Costs
• Ca. 5500 Machine-Hours were required
• 1100 € billed by AWS for that
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AWS Costs
• Ca. 5500 Machine-Hours were required
• 1100 € billed by AWS for that
• Cost for other services negligible *
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AWS Costs
• Ca. 5500 Machine-Hours were required
• 1100 € billed by AWS for that
• Cost for other services negligible *
• * At first, we underestimated SDB cost
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Takeaways
• Web Data Commons now publishes the largest set of
structured data from Web pages available
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Takeaways
• Web Data Commons now publishes the largest set of
structured data from Web pages available
• Large-Scale Web Analysis now possible with Common Crawl
datasets
13

Takeaways
• Web Data Commons now publishes the largest set of
structured data from Web pages available
• Large-Scale Web Analysis now possible with Common Crawl
datasets
• AWS great for massive ad-hoc computing power and
complexity reduction
13

Takeaways
• Web Data Commons now publishes the largest set of
structured data from Web pages available
• Large-Scale Web Analysis now possible with Common Crawl
datasets
• AWS great for massive ad-hoc computing power and
complexity reduction
• Choose your architecture wisely, test by experiment, for us
EMR was too expensive.
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Thank You!
Questions?
Want to hire me?
Web Resources: http://webdatacommons.org
http://hannes.muehleisen.org