Phased cutover is "a divide and conquer approach," migrating services in "phases or waves." That's safer and permits more testing, McCormack says.īig Bang was judged too dangerous. "This is also known as the 'cross your fingers, close your eyes, press the button and hope everything is OK plan!'" McCormack says. When considering the migration timetable, Evernote was caught in a conundrum: The "Big Bang" methodology is a single point where cutting over 100% from the old to new. To move to Google (Nasdaq: GOOG) Cloud, Evernote used a combination of "lift and shift" for some services - namely shards, UserStore and most supporting services - while other services were transformed for their new environment these included user attachment storage and load balancing, McCormack says.
The service also uses front-end load balancing, and about 200 Linux servers for supporting services such as caching and batch processing. And the User Attachment Storage manages (you guessed it) attachments. The UserStore is a MySQL-based central user and preferences database that also manages authentication. The migration improves performance (it seems that way to me, particularly on the iPhone app, although I wouldn't swear to it), enhances disaster recovery capabilities, and beefs up security by encrypting data at rest.Įvernote provides technical details: The service is comprised of 762 shards or NoteStores, where the actual notes are stored - about 300,000 per shard, managing 200 million user accounts, says Ben McCormack, Evernote vice president of operations. The transition involved moving 5 billion notes and 5 billion attachments, comprising more than 4 petabytes of data.
Though subtle at first, this move to the cloud will bring about more noticeable benefits in the not-so-distant future, such as increased uptime, security improvements, and faster delivery of new and innovative features. Rather than pouring resources into the day-to-day maintenance of equipment and software required for running the Evernote service, we can now focus more of our time and energy into responding to customer needs. My personal experience backs that up - I'm a heavy Evernote user - and I haven't seen any complaints about performance.
Chan says in a post on the Evernote Blog.
"Because this migration took place in the background, you wouldn't have noticed any changes to your day-to-day experience in Evernote," Evernote Senior Technical Writer SiNing Y. Evernote found Bob Ross socks to commemorate its cloud migration.
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