reuse hash

Author: jan-elastic

server/src/main/java/org/elasticsearch/common/hash/MurmurHash3.java

@@ -81,7 +81,7 @@ static class IntermediateResult {
     private static long C1 = 0x87c37b91114253d5L;
     private static long C2 = 0x4cf5ad432745937fL;
 
-    protected static long fmix(long k) {
+    public static long fmix(long k) {
         k ^= k >>> 33;
         k *= 0xff51afd7ed558ccdL;
         k ^= k >>> 33;

test/framework/src/main/java/org/elasticsearch/test/MixWithIncrement.java

@@ -12,6 +12,7 @@
 import com.carrotsearch.randomizedtesting.SeedDecorator;
 
 import org.elasticsearch.common.Randomness;
+import org.elasticsearch.common.hash.MurmurHash3;
 
 import java.util.concurrent.atomic.AtomicLong;
 
@@ -59,15 +60,6 @@ public long decorate(long seed) {
     }
 
     public static void next() {
-        mix.updateAndGet(MixWithIncrement::fmix64);
-    }
-
-    private static long fmix64(long k) {
-        k ^= k >>> 33;
-        k *= -49064778989728563L;
-        k ^= k >>> 33;
-        k *= -4265267296055464877L;
-        k ^= k >>> 33;
-        return k;
+        mix.updateAndGet(MurmurHash3::fmix);
     }
 }