Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15917#discussion_r88457983
  
    --- Diff: 
common/sketch/src/main/java/org/apache/spark/util/sketch/Murmur3_128.java ---
    @@ -0,0 +1,135 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *    http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.spark.util.sketch;
    +
    +/**
    + * 128-bit Murmur3 hasher.
    + * Best perfomance is on x86_64 platform
    + * Based on implementation 
https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp
    + */
    +final class Murmur3_128 {
    --- End diff --
    
    OK, maybe that makes sense. If bothering with a custom impl, why not 64 
bits instead of 128? it would avoid needing a long[2] to take the result?


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