A hash function is any well-defined procedure or mathematical function that converts a large amount of data into a small datum, usually a single integer.

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A hash function takes an item of a given type and generates an integer hash value within a given range.


We present jump consistent hash, a fast, minimal memory, consistent hash algorithm that can be expressed in about 5 lines of code. In comparison to the algorithm of Karger et al., jump consistent hash requires no storage, is faster, and does a better job of evenly dividing the key space among the buckets and of evenly dividing the workload when the number of buckets changes. Its main limitation is that the buckets must be numbered sequentially, which makes it more suitable for data storage applications than for distributed web caching.