HADOOP-15696. KMS performance regression due to too many open file descriptors after Jetty migration. Contributed by Wei-Chiu Chuang.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java

@@ -141,6 +141,10 @@ public final class HttpServer2 implements FilterContainer {
       "hadoop.http.selector.count";
   // -1 to use default behavior of setting count based on CPU core count
   public static final int HTTP_SELECTOR_COUNT_DEFAULT = -1;
+  // idle timeout in milliseconds
+  public static final String HTTP_IDLE_TIMEOUT_MS_KEY =
+      "hadoop.http.idle_timeout.ms";
+  public static final int HTTP_IDLE_TIMEOUT_MS_DEFAULT = 10000;
   public static final String HTTP_TEMP_DIR_KEY = "hadoop.http.temp.dir";
 
   public static final String FILTER_INITIALIZER_PROPERTY
@@ -445,6 +449,8 @@ public HttpServer2 build() throws IOException {
       int responseHeaderSize = conf.getInt(
           HTTP_MAX_RESPONSE_HEADER_SIZE_KEY,
           HTTP_MAX_RESPONSE_HEADER_SIZE_DEFAULT);
+      int idleTimeout = conf.getInt(HTTP_IDLE_TIMEOUT_MS_KEY,
+          HTTP_IDLE_TIMEOUT_MS_DEFAULT);
 
       HttpConfiguration httpConfig = new HttpConfiguration();
       httpConfig.setRequestHeaderSize(requestHeaderSize);
@@ -470,6 +476,7 @@ public HttpServer2 build() throws IOException {
         connector.setHost(ep.getHost());
         connector.setPort(ep.getPort() == -1 ? 0 : ep.getPort());
         connector.setAcceptQueueSize(backlogSize);
+        connector.setIdleTimeout(idleTimeout);
         server.addListener(connector);
       }
       server.loadListeners();
@@ -483,7 +490,13 @@ private ServerConnector createHttpChannelConnector(
           conf.getInt(HTTP_SELECTOR_COUNT_KEY, HTTP_SELECTOR_COUNT_DEFAULT));
       ConnectionFactory connFactory = new HttpConnectionFactory(httpConfig);
       conn.addConnectionFactory(connFactory);
-      configureChannelConnector(conn);
+      if(Shell.WINDOWS) {
+        // result of setting the SO_REUSEADDR flag is different on Windows
+        // http://msdn.microsoft.com/en-us/library/ms740621(v=vs.85).aspx
+        // without this 2 NN's can start on the same machine and listen on
+        // the same port with indeterminate routing of incoming requests to them
+        conn.setReuseAddress(false);
+      }
       return conn;
     }
 
@@ -659,17 +672,6 @@ private static void addNoCacheFilter(ServletContextHandler ctxt) {
                  Collections.<String, String> emptyMap(), new String[] { "/*" });
   }
 
-  private static void configureChannelConnector(ServerConnector c) {
-    c.setIdleTimeout(10000);
-    if(Shell.WINDOWS) {
-      // result of setting the SO_REUSEADDR flag is different on Windows
-      // http://msdn.microsoft.com/en-us/library/ms740621(v=vs.85).aspx
-      // without this 2 NN's can start on the same machine and listen on
-      // the same port with indeterminate routing of incoming requests to them
-      c.setReuseAddress(false);
-    }
-  }
-
   /** Get an array of FilterConfiguration specified in the conf */
   private static FilterInitializer[] getFilterInitializers(Configuration conf) {
     if (conf == null) {

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServer.java

@@ -55,6 +55,7 @@
 import javax.ws.rs.core.MediaType;
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.lang.reflect.Field;
 import java.net.HttpURLConnection;
 import java.net.URI;
 import java.net.URL;
@@ -702,6 +703,19 @@ public void testBacklogSize() throws Exception
     assertEquals(backlogSize, listener.getAcceptQueueSize());
   }
 
+  @Test
+  public void testIdleTimeout() throws Exception {
+    final int idleTimeout = 1000;
+    Configuration conf = new Configuration();
+    conf.setInt(HttpServer2.HTTP_IDLE_TIMEOUT_MS_KEY, idleTimeout);
+    HttpServer2 srv = createServer("test", conf);
+    Field f = HttpServer2.class.getDeclaredField("listeners");
+    f.setAccessible(true);
+    List<?> listeners = (List<?>) f.get(srv);
+    ServerConnector listener = (ServerConnector)listeners.get(0);
+    assertEquals(idleTimeout, listener.getIdleTimeout());
+  }
+
   @Test
   public void testHttpResponseDefaultHeaders() throws Exception {
     Configuration conf = new Configuration();

hadoop-common-project/hadoop-kms/src/main/resources/kms-default.xml

@@ -101,6 +101,13 @@
     </description>
   </property>
 
+  <property>
+    <name>hadoop.http.idle_timeout.ms</name>
+    <value>1000</value>
+    <description>
+      KMS Server connection timeout in milliseconds.
+    </description>
+  </property>
   <!-- KMS Backend KeyProvider -->
 
   <property>

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/resources/httpfs-default.xml

@@ -54,6 +54,13 @@
   </property>
 
   <!-- HTTP properties -->
+  <property>
+    <name>hadoop.http.idle_timeout.ms</name>
+    <value>1000</value>
+    <description>
+      Httpfs Server connection timeout in milliseconds.
+    </description>
+  </property>
 
   <property>
     <name>hadoop.http.max.threads</name>