team members abhinav mishra amber palekar rahul iyer vishakha gupta
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Team Members
Abhinav Mishra
Amber Palekar
Rahul Iyer
Vishakha Gupta
Imagine Cup Presentation
Carnegie Mellon UniversityTeam O(1)
Agenda
• Motivation• Innovation• System Design Overview
– Databases– Compute Servers– Web Servers– Traffic model and Data Collection Servers– Maps
• Quantitative Measurements• Architectural Highlights• Future Directions• Questions/Comments
Looks Familiar?
Motivation & Aim
• Get you to your destination faster• Optimal Routing on Roads using Dynamic Traffic
Balancing• Gives you the “best” route to your destination
– Optimal Time– Optimal Distance
Innovation
• Different from Yahoo Maps, MapQuest, Google Maps– Bidding good bye to static maps
• Leveraging cutting edge technologies– Minneapolis has already deployed traffic
sensors at intersections
• Scalability and Fault-tolerance built into system (and not “patched” onto it)
A Problem
Let’s just meet somewhere!
I have an idea! Let’s meet at the Subway on
41st.
I’m leavin’ for the Starbucks on
42nd, c’ya guys there!
Our Solution
Where should we meet?
Where should we meet?
Where should we meet?
Thai Café on 43rd is your best option
Thai Café on 43rd is your best option
Thai Café on 43rd is your best option
System Design Overview
DB Handler
Traffic Model
Maps
Architectural Highlights• Load Balancing
– Web Servers– Compute Servers
• Scalability– Compute Servers– Database*
• Fault tolerance– Compute Servers: designed to be
stateless– Web Server– Database*
Quantitative measurements• Original Design targeted at a 1000
intersection map• Current system considers all of
Allegheny county – ~45,000 Intersections & 60,000 Roads
• Loading the map for all of Allegheny county takes about 6 seconds
• We update the map every minute– Update takes roughly 3 seconds
Future Directions
• Server-side map generation engine• More elaborate model for simulation of
real-life traffic • Enabling SMS results for user queries• Better text prediction algorithms for the
mobile GUI• Sturdier database infrastructure
– 2 Phase Commit is too slow?
Postmortem
• .NET – a boon for software development– Fast, Handy, Bundled with an excellent IDE– ADO.NET: simple to use
• Microsoft SQL Server: fast!
– ASP.NET: enabled deployment on mobile devices– .NET Remoting: shorter learning curve– Performance counters
• Oh how we wish!– that ADO.NET allowed >2 data readers– that we could try this on Windows Server 2003
Questions
Thank You
User GUI• User chooses source and destination intersections
from drop-down lists & chooses one of the time-optimal or distance-optimal route options
• Remotely invoke route computation algorithm at the compute server
•Commercial Value – Advertisement Server
Administrator Interface• Handy tool for the Cruise
Control Administrator• Saves configuration time,
designed to handle large number of nodes/links
• Add/Modify/Delete on:– Nodes– Links– System Parameters
• Uses backend AdminInterface class which talks to the DB handler
Compute Servers• Uses optimized version of Dijkstra’s algorithm
with a priority queue implementation to improve scalability.– Euclidean distance as a heuristic to converge faster
on routes• Refreshes the graph
– Every ‘refreshInterval’– Whenever node and link details change in system
• Registers itself with the .NET registry to make itself available for remote invocation (uses Singleton)
• Answers requests from web server, on-demand• Fault tolerance – handle lost DB connectivity
for a while• Load balancing – server-initiated load
balancing
DB & DB Handler
• The Database Handler provides an interface for clients to access the database
• The DB Handler acts like a “stub” providing marshalling and un-marshalling
• Database Daemons act as “middlemen” between the client DB Handlers and the databases
• Uses TCP connections instead of Atomic Broadcast
Traffic Model & Collection• Traffic model periodically generates load over each
link in the map depending on the type of road– Downtown roads are “Heavy” at rush hour– Small streets aren’t
• Model sends periodic updates to collection server as a formatted string
• Multi-threaded server collects data generated by traffic model, parses it & updates the DB
• New models can be seamlessly plugged in• Fault tolerant, replicated servers running• Highly Scalable
Web Server• Uses Microsoft IIS• On request, remotely invokes compute nodes
to calculate optimal route
• Fault tolerant• Load balancing• Highly available
• Ad Server runs on Web Server– Decides ad to post
Maps• Tiger Maps
– Street Level Maps– Census Information for:
• Counties• Street Names• Zipcodes
• The GrooveNet project– Uses Tiger Maps– Interprets them as a
graph
• We leverage existing map interpretation code of GrooveNet– Populate database with
data from GrooveNet
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