Expedia Use Case for DataStax Enterprise

1. Cassandra Evolution at Expedia

2. Adoption timeline
2011
• Q2 Cassandra 0.6 live for First Pricing index
• Q3 Cassandra 0.7 live for Session state cache
• Q3 Cassandra 0.7 for high speed transaction logging
• Q4 Cassandra Splunk integration complete for put/get
• Q4 Cassandra Web Portal and RESTful interface available
2012
• Q2 DataStax upgrade for first pricing index & enable SOLR
• Q2 DataStax live for Second Pricing index & enable SOLR
• Q2 DataStax live for high speed transaction logging
• Q2 Onboarding new markets to indexes
• Q2 DataStax PoC for Content cache
• Q3 Upgrade Web Portal to use SOLR and Hadoop
functionality

3. Pricing Index Use Case

4. Pricing Index Ring Solution
Current Solution
• 9 nodes split across 3 racks running Cassandra 1.0
• There is a separate 2 node App tier written in Java that access data
in CFS
• On top of that is a 4 node SOLR tier for search
Next Gen 2Q12 solution
• DataStax upgrade and elimination of app and SOLR nodes
• Given this change we can onboard two new indexes and all major
markets
• New ring is 27 nodes in one physical datacenter and will expand to
54 nodes in June split across two datacenters
• Expanding from initial small market set to more markets, price
elements and options
• Using DataStax solution is showing positive results in the lab and
shaving seconds off of user search times

5. High Speed Logging Use Case

6. Logging Ring Solution
Current Solution
• 40 MSSQL database high end servers using 160TB Tier 1 SAN and 14
days of online information and no redundancy or replication
• 5 Reporting archive MSSQL databases that keep 30 day roll ups of
the 40 databases for trending
• Need to know SQL to pull any data or reports, have multiple db
developers working on team
Next Gen 2Q12 solution
• DataStax deployment of 72 commodity nodes across 2 physical
datacenter with replication
• 1/3 of nodes will have Hadoop enabled for reporting and will be
available via web service for non-SQL business personnel
• 90 day retention window of raw data
• Cost Savings $1.5M in 2012

7. Logging Ring Architecture
Data Data
Center 1 Center 2

8. Access Architecture

9. Summary
• Current footprint 132 nodes production, 27 nodes dev, 24
nodes PoC
• Expedia is investing heavily in Cassandra and specifically
DataStax solution to optimize user experience
• Heavily leveraging Hadoop and SOLR integrations to get rapid
value from solutions
• Using DataStax is shaving seconds off of search times which
equates to significantly better customer experience
• Continuing to look at new use cases and expect to have 240
nodes of DataStax in production by Q412

10. Questions ?