From ce54b7e55d912b2f8c34801209c86518cd4642e5 Mon Sep 17 00:00:00 2001
From: GuoPhilipse <46367746+GuoPhilipse@users.noreply.github.com>
Date: Thu, 15 Sep 2022 00:53:25 +0800
Subject: [PATCH] HADOOP-18118. Fix KMS Accept Queue Size default value to 500
 (#3972)

---
 .../src/main/java/org/apache/hadoop/http/HttpServer2.java  | 2 +-
 .../test/java/org/apache/hadoop/http/TestHttpServer.java   | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java
index 934848b826..178f761191 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java
@@ -144,7 +144,7 @@ public final class HttpServer2 implements FilterContainer {
 
   public static final String HTTP_SOCKET_BACKLOG_SIZE_KEY =
       "hadoop.http.socket.backlog.size";
-  public static final int HTTP_SOCKET_BACKLOG_SIZE_DEFAULT = 128;
+  public static final int HTTP_SOCKET_BACKLOG_SIZE_DEFAULT = 500;
   public static final String HTTP_MAX_THREADS_KEY = "hadoop.http.max.threads";
   public static final String HTTP_ACCEPTOR_COUNT_KEY =
       "hadoop.http.acceptor.count";
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServer.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServer.java
index 062033d4d5..b71610588c 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServer.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServer.java
@@ -743,6 +743,13 @@ public void testBacklogSize() throws Exception
     assertEquals(backlogSize, listener.getAcceptQueueSize());
   }
 
+  @Test
+  public void testBacklogSize2() throws Exception
+  {
+    Configuration conf = new Configuration();
+    assertEquals(500, conf.get(HttpServer2.HTTP_SOCKET_BACKLOG_SIZE_KEY));
+  }
+
   @Test
   public void testIdleTimeout() throws Exception {
     final int idleTimeout = 1000;