Performance improvements for BytesRefHash

CHANGELOG.md

@@ -137,6 +137,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Replace the deprecated IndexReader APIs with new storedFields() & termVectors() ([#7792](https://github.com/opensearch-project/OpenSearch/pull/7792))
 - [Remote Store] Add support to restore only unassigned shards of an index ([#8792](https://github.com/opensearch-project/OpenSearch/pull/8792))
 - Add safeguard limits for file cache during node level allocation ([#8208](https://github.com/opensearch-project/OpenSearch/pull/8208))
+- Performance improvements for BytesRefHash ([#8788](https://github.com/opensearch-project/OpenSearch/pull/8788))
 - Add support for aggregation profiler with concurrent aggregation ([#8801](https://github.com/opensearch-project/OpenSearch/pull/8801))
 - [Remove] Deprecated Fractional ByteSizeValue support #9005 ([#9005](https://github.com/opensearch-project/OpenSearch/pull/9005))
 - Add support for aggregation profiler with concurrent aggregation ([#8801](https://github.com/opensearch-project/OpenSearch/pull/8801))

benchmarks/src/main/java/org/opensearch/common/hash/HashFunctionBenchmark.java

@@ -0,0 +1,172 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.common.hash;
+
+import org.apache.lucene.util.StringHelper;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.infra.Blackhole;
+
+import java.util.Random;
+
+@Fork(value = 3)
+@Warmup(iterations = 1, time = 1)
+@Measurement(iterations = 3, time = 3)
+@BenchmarkMode(Mode.Throughput)
+public class HashFunctionBenchmark {
+
+    @Benchmark
+    public void hash(Blackhole bh, Options opts) {
+        bh.consume(opts.type.hash(opts.data));
+    }
+
+    @State(Scope.Benchmark)
+    public static class Options {
+        @Param({ "MURMUR3", "T1HA1" })
+        public Type type;
+
+        @Param({
+            "1",
+            "2",
+            "3",
+            "4",
+            "5",
+            "6",
+            "7",
+            "8",
+            "9",
+            "10",
+            "12",
+            "14",
+            "16",
+            "18",
+            "21",
+            "24",
+            "28",
+            "32",
+            "36",
+            "41",
+            "47",
+            "54",
+            "62",
+            "71",
+            "81",
+            "90",
+            "100",
+            "112",
+            "125",
+            "139",
+            "156",
+            "174",
+            "194",
+            "220",
+            "245",
+            "272",
+            "302",
+            "339",
+            "384",
+            "431",
+            "488",
+            "547",
+            "608",
+            "675",
+            "763",
+            "863",
+            "967",
+            "1084",
+            "1225",
+            "1372",
+            "1537",
+            "1737",
+            "1929",
+            "2142",
+            "2378",
+            "2664",
+            "3011",
+            "3343",
+            "3778",
+            "4232",
+            "4783",
+            "5310",
+            "5895",
+            "6662",
+            "7529",
+            "8508",
+            "9444",
+            "10483",
+            "11741",
+            "13150",
+            "14597",
+            "16495",
+            "18475",
+            "20877",
+            "23383",
+            "25956",
+            "29071",
+            "32560",
+            "36142",
+            "40841",
+            "46151",
+            "52151",
+            "57888",
+            "65414",
+            "72610",
+            "82050",
+            "91076",
+            "102006",
+            "114247",
+            "127957",
+            "143312",
+            "159077",
+            "176576",
+            "199531",
+            "223475",
+            "250292",
+            "277825",
+            "313943",
+            "351617",
+            "393812" })
+        public Integer length;
+        public byte[] data;
+
+        @Setup
+        public void setup() {
+            data = new byte[length];
+            new Random(0).nextBytes(data);
+        }
+    }
+
+    public enum Type {
+        MURMUR3((data, offset, length) -> StringHelper.murmurhash3_x86_32(data, offset, length, 0)),
+        T1HA1((data, offset, length) -> T1ha1.hash(data, offset, length, 0));
+
+        private final Hasher hasher;
+
+        Type(Hasher hasher) {
+            this.hasher = hasher;
+        }
+
+        public long hash(byte[] data) {
+            return hasher.hash(data, 0, data.length);
+        }
+    }
+
+    @FunctionalInterface
+    interface Hasher {
+        long hash(byte[] data, int offset, int length);
+    }
+}