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TRADESTORM Inc. presents
HATS: Highly Available Trading of Securities
J. McIlvain, H. Phillips, Z. Wang
Distributed Systems 45-612
Information Networking Institute
Introduction
• What is HATS
• Who would use HATS
Objective
• Provide highly available service
• Failure tolerance: primary back-up
Implementation Tools
• Java
• RMI
• JDBC
System Design
• Three tier model:
•
•
•
•
Client
RMI servers: LDS, TS
Database: MDB, TDB
Market Engine
Basic System Model
Primary Back-up model
Client Application
Load Distribution Server
• Provides services to clients
– Registration, authentication…
• Keeps information of each Trading Server
– Registration, state of TS...
• Keeps information on Databases
• Keeps information on Market Engines
Trading Server
• On start up, must register with LDS
• Communicate with
– the Client Application
– the Databases
• When crash:
– the clients are redistributed over all the TS
Database
• Market Trade Database
– keeps market information
– updates by market engine
• Trader (Client Account) Database
– keeps clients personal information
– keeps portfolio information
• When crash, replace by back-up server
Market Engine
• On start up, must register on LDS
• Periodically
– downloads web data
– updates the MDB
• When crash, back-up takes over as ME
Discussion
• Highly available
• Failure tolerance