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1 Prototyping Data Intensive Apps: TrendingTopics.org Pete Skomoroch Research Scientist at LinkedIn Consultant at Data 09/29/09 1

2 Talk Outline TrendingTopics Overview Wikipedia Page View Dataset Hadoop on Amazon EC2 Loading Data on EC2: Amazon EBS & S3 Daily Timelines with Hadoop Streaming Hive Data Warehouse Layer Trend Computation with Hive Hooking It All Together Front End & Visualizations

3 Data Intensive Web Apps Batch data mining or prediction with Hadoop Iterate quickly with high level languages & tools Pig, Hive, Clojure, Cascading, Python, Ruby EC2: Get running with limited initial capital Use external data and APIs in novel ways Recent real world example: FlightCaster 3

4 TrendingTopics.org 4

5 Daily Pageview Timeline Charts 5

6 Detects Rising Trends with Hadoop 6

7 TrendingTopics is Open Source Built as a side project at Data Wrangling Core code completed over 2 weeks in June Code on Github Data released on Amazon Public Datasets 7

8 Technology Stack 8

9 Application Data Flow 9

10 Hadoop on Amazon EC2 EC2: Launch servers on demand S3: Simple Storage Service EBS: Persistent disks for EC2 Used Cloudera Hadoop Distribution Includes Pig, Hive, HBase, Sqoop, EBS integration Allows customization of Hadoop EC2 instances See EC2 Docs and Tutorials on the Cloudera site 10

11 Wikipedia Page View Log Data 1 TB of hourly log files from Wikipedia Squid proxy Filename contains timestamp Columns: project, pagename, pageviews, & bytes 11

12 Wikipedia Redirect Data Many articles in the logs redirect to canonical titles Amazon Public Dataset contains a lookup table: 12

13 Loading Data into Hadoop on EC2 Hadoop can read directly from Amazon S3 Pulling in data from EBS snapshots 13

14 Python Streaming for Daily Timelines 14

15 Streaming: Filter & Aggregate Logs 15

16 Hive Data Warehouse Layer on EC2 Easy for analysts familar with SQL Familar syntax (SELECT, GROUP BY, SORT...) Hide the MR muck, for JOIN, UNION, etc. Supports streaming UDFs Sampling: generate datasets for R&D Used on Timeline and Redirect data 16

17 Fixing Wiki Redirects with Hive JOIN 17

18 Trend Detection With Hadoop 18

19 Hourly Data: Java vs. Hangover 19

20 Robust Regression with R & Hadoop Fit R model to hourly data for 2.3M Wiki articles Trending if article views >> model prediction Page View Spikes 20

21 Call Python Trend Mapper from Hive 21

22 Simple Trend Calculation in Python 22

23 Use Trend Scores to Rank Articles 23

24 Exporting Data from our EC2 Cluster Output files are delimited text for bulk DB load Distcp outputs to S3: hadoop distcp /user/output s3n://trendingtopics/exports Hive can create tables directly over S3 filesystem: create external table foo... location 's3n://trendingtopics/ hiveoutput 24

25 Hooking It All Together 25

26 Ruby on Rails Front End Run a development version of the app locally: 26

27 Automate & Deploy with EC2onRails EC2onRails: Ubuntu server images for EC2, runs instances of Ruby on Rails, MySQL, Apache Daily cron job on App server launches Hadoop Hadoop EC2 boot script checks out latest trend detection code from Github Capistrano tasks deploy new application code, maintain DB, cache, archives 27

28 Cron Triggers Hadoop Jobs on EC2 Modify Cloudera hadoop-ec2-init-remote.sh boot script 28

29 Bash Scripts Automate Daily Run run_daily_merge.sh kicks off Hadoop/Hive jobs Queries MySQL for last run date Generates timelines with Hadoop streaming Hive operates on timeline data, computes Trends with Python Hive output copied to S3 Calls remote script to load MySQL staging tables Hadoop cluster self terminates Remote script swaps staging and prod after load 29

30 Capistrano Tasks Capistrano: Ruby tool for automating tasks on one or more remote servers ( Deploys Rails code and cron jobs to App server Cleanup tasks are triggered at end of load: Flags featured Wikipedia articles Indexes MySQL tables, Flushes cache 30

31 Visualization APIs Google Viz API: Annotated Timeline for Rails Google Charts sparklines: gc4r Yahoo BOSS image search in Rails 31

32 Ideas & Next Steps Try out the code on Github Show related articles using link graph data Extract trending phrases from article text Boost Twitter trending topics with Wikipedia logs Update top trends hourly Use date partitioned tables, incremental updates Add a real search engine (uses MySQL now) 32

33 LinkedIn Analytics Team We re Hiring 33

34 Questions? Contact Blog: datawrangling.com Code Hadoop blog posts & tutorials on the Cloudera site Amazon EMR tutorial on Finding Similar Artists with Hadoop & Last.FM data 34

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