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By dotCore
via tech.taskrabbit.com
Submitted: Sep 29 2013 / 16:56

Redis is a single-threaded in-memory key/value store similar to memcached. Redis has other features like pub/sub and more advanced data structures, but the key feature that makes it an ideal storage engine for a queue and a message bus is that is can perform atomic operations. Atomic operations are the kind of operations you can expect to do on in-process data (like Array.pop or Array.splice) but in way that keeps the data sane for everyone connected to the database.
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