tinyurl

Prerequisites

make, c-compiler, java

Setup and Run

./setup.sh

This will download and build redis

./start.sh

This will start:

• 1 Redis master
• 2 Redis slaves
• 1 HTTP Frontend

Test

Create a tiny url:

• curl -d "URL=http://www.google.se" http://localhost:8080/create

Test a tiny url

• curl -v http://localhost:8080/lookup/7c7fea
• Paste http://localhost:8080/lookup/7c7fea into a browser

Solution returns HTTP 302 if lookup is successful, 404 if not

Configuration

Edit frontend/src/main/resources/application.conf

• finagle_address - Bind the web server to this address, e.g. localhost:8080

• public_address - Address sent to the clients, e.g. http://localhost:8080 => http://localhost:8080/lookup/abcdef

• hash_size - number of characters in the generated tiny URL

• redis_master - host:port to the Redis master, writes will happen here - example localhost:6379

• redis_slave - semicolon separated list of slaves, lookups will go to these - example localhost:7777;localhost:8888

Possible Improvements

• Check for hash collisions, if that happens, use a one char longer hash
• If the master redis server failes, promote a slave to master
• If a slave failes, mark it as bad, maybe just for a while.
• Make it possible to shard/partition the writes over several masters