Use xxHash instead of MurmurHash3

[plokhotnyuk]

http://cyan4973.github.io/xxHash/

[alexandrnikitin]

Agree, it would be nice to have it built into the lib. I found a good Java implementation here: https://github.com/OpenHFT/Zero-Allocation-Hashing

[velvia]

+1
Although this can be worked around just by using XXHash itself to compute a 64-bit value.

Here is another XXHash implementation which seems fairly fast:
https://github.com/jpountz/lz4-java

[asoltysik]

How is the uniformity of xxHash? Couldn't find any bechmarks wrt to that.

[velvia]

According to the XXHash website, it has a very high uniformity score. However testing is best.

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