Slide Deck from my recent talk at the first New England PostgreSQL User group meeting.

1. No, we’re not a travel agency www.tripadvisor.com/careers

2. Postgres at TripAdvisor By Don O’Neill & Boris Partensky 2 © 2011 TripAdvisor LLC All rights reserved.

3. TripAdvisor is the world’s largesttravel site 3 © 2011 TripAdvisor LLC All rights reserved.

4. 4 40M monthly visitors 4M visitors/day 20+M registered members 45+M reviews & opinions © 2011 TripAdvisor LLC All rights reserved.

5. Business runs on Postgres Large Mission critical deployment Combination of 8.3 and 8.4 Site Technologies include Linux (CentOS), Apache Java, Tomcat, Velocity, and Memcached No commercial Software – All Open Source Web Scale Deployment Over 100 Frontend and Backend servers per Data Center 14 Postgres Database Servers per Data Center DR Data Center with Replication between the two Platform 5 © 2011 TripAdvisor LLC All rights reserved.

6. 33 Postgres Servers across 3 Data Centers Not including Dev and QA servers SSD’s instead of Spinning disks for select servers Multiple Read Only DB Servers Load Balanced using BigIP Sync’d using DB Mirror replication Just under 1 TB of data in multiple databases Sharded Pin Table Over 1.5 billion rows Sharded to improve read and write performance Spread over 12 databases on 2 Servers Scale out to multiple servers as needed Routing logic built into our application layer By the Numbers 6 © 2011 TripAdvisor LLC All rights reserved.

7. All Servers configured as Active/Passive Cluster Not using Shared Disks or SAN’s DRBD for Block level replication between systems Heartbeat for automatic failover between nodes Data Replicated to DR Site TripAdvisor has 2 Data centers (MA and VA) One site “Live” at a time Equal capacity at both sites Routinely switch between sites Data Replicated between data centers Redundancy/Failover 7 © 2011 TripAdvisor LLC All rights reserved.

8. Replication based on DBmirror Like Slonyonly deprecated Community project once part of the core distribution Trigger based Master/Slave Replication Written in C and Perl All replicated tables must have primary keys TripAdvisor Updates include A Rewrite in Java! Support for SQL Server Lots of Hardening for large scale use Replication 8 © 2011 TripAdvisor LLC All rights reserved.

9. 20 TB Data Warehouse today Expecting to grow significantly in 12 months 16 Node cluster expanding to 24 Based on Hadoop and Hive Reporting and Cubes built with SQL Server End users access the data via Excel and Reporting Services Critical for the growth of the business Long term data storage in Hadoop and not our SAN! Mobile Applications Award winning travel application Supported in iPhone, iPad, Android, Nokia, Windows, Palm http://www.tripadvisor.com/MobileApps Facebook Integration More and more users logging in via Facebook Better social experience on the site Major Initiatives 9 © 2011 TripAdvisor LLC All rights reserved.

10. Q&A Questions? Did I mention we’re hiring? 10 © 2011 TripAdvisor LLC All rights reserved.