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389 high scalability-2008-09-23-How to Scale with Ruby on Rails


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Introduction: By George Palmer of 3dogsbark.com. Covers: * How you start out: shared hosting, web server DB on same machine. Move two 2 machines. Minimal code changes. * Scaling the database. Add read slaves on their own machines. Then master-master setup. Still minimal code changes. * Scaling the web server. Load balance against multiple application servers. Application servers scale but the database doesn't. * User clusters. Partition and allocate users to their own dedicated cluster. Requires substantial code changes. * Caching. A large percentage of hits are read only. Use reverse proxy, memcached, and language specific cache. * Elastic architectures. Based on Amazon EC2. Start and stop instances on demand. For global applications keep a cache on each continent, assign users to clusters by location, maintain app servers on each continent, use transaction replication software if you must replicate your site globally.


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