Redis cache

Redis is a advanced key-value cache and store. Keys can contain strings, hashes, lists, sets, sorted sets, bitmaps and hyperloglogs. Redis is written in ANSI C and works in most POSIX systems like Linux.

Redis keys are binary safe, this means that you can use any binary sequence as a key, from a string like "foo" to the content of a JPEG file. The maximum allowed key size is 512 MB. But using long key is not a good idea, because the lookup of the key in the dataset may require several costly key-comparisons.

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