public static Hash getInstance() {
    return _instance;
  }
This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See
http://code.google.com/p/smhasher/wiki/MurmurHash3 for details.
<p>
MurmurHash3 is the successor to MurmurHash2. It comes in 3 variants, and the 32-bit version
targets low latency for hash table use.
</p>
hbase-common/src/main/java/org/apache/hadoop/hbase/util/MurmurHash3.java