Evernote Architecture – 9 Million Users and 150 Million Requests a Day

Application redundancy. Each box runs two VMs. A primary VM runs the core stack: Debian + Java 6 + Tomcat + Hibernate + Ehcache +  Stripes + GWT + MySQL (for metadata) + hierarchical local file systems (for file data). DRDB is used to replication a primary VM to a secondary VM on another box. Heartbeat is used to fail over to a secondary VM is the primary VM dies. A smart way to use those powerful machines and make a reliable system with fewer resources.

(Full Story: Evernote Architecture – 9 Million Users and 150 Million Requests a Day)

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