From 8ce2cdb004a6b968ad51a985fa262b84fa97d041 Mon Sep 17 00:00:00 2001
From: Xinda <xdshent@gmail.com>
Date: Wed, 26 Jan 2022 10:44:01 +0800
Subject: [PATCH] perf: avoid multiple expansion when the number of elements in
 the `MessageConst` class is determined (#3721)

`HashSet`, threshold = initialCapacity * 0.75
---
 .../java/org/apache/rocketmq/common/message/MessageConst.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/src/main/java/org/apache/rocketmq/common/message/MessageConst.java b/common/src/main/java/org/apache/rocketmq/common/message/MessageConst.java
index ba9b7443cb..81b7823f3b 100644
--- a/common/src/main/java/org/apache/rocketmq/common/message/MessageConst.java
+++ b/common/src/main/java/org/apache/rocketmq/common/message/MessageConst.java
@@ -57,7 +57,7 @@ public class MessageConst {
 
     public static final String KEY_SEPARATOR = " ";
 
-    public static final HashSet<String> STRING_HASH_SET = new HashSet<String>();
+    public static final HashSet<String> STRING_HASH_SET = new HashSet<>(64);
 
     static {
         STRING_HASH_SET.add(PROPERTY_TRACE_SWITCH);