The Robot Lives

A Fractional Key System for Memcache.

Fragmented or as I prefer to call them fractional keys provide a relatively trouble free way of managing the inter-dependencies of cached data.

At its heart fractional keys are simply tag based keys. Where they differ from the standard implementation of tag based keys is that each tag has an associated version number. This allows us to invalidate all keys dependent on a specific tag automatically by incrementing its associated version.

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