HADOOP-8069. Enable TCP_NODELAY by default for IPC. (Contributed by Todd Lipcon)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1614242 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -460,6 +460,9 @@ Release 2.6.0 - UNRELEASED
 
     HADOOP-10882. Move DirectBufferPool into common util. (todd)
 
+    HADOOP-8069. Enable TCP_NODELAY by default for IPC. (Todd Lipcon via
+    Arpit Agarwal)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java

@@ -207,7 +207,7 @@ public class CommonConfigurationKeysPublic {
   public static final String  IPC_CLIENT_TCPNODELAY_KEY =
     "ipc.client.tcpnodelay";
   /** Defalt value for IPC_CLIENT_TCPNODELAY_KEY */
-  public static final boolean IPC_CLIENT_TCPNODELAY_DEFAULT = false;
+  public static final boolean IPC_CLIENT_TCPNODELAY_DEFAULT = true;
   /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
   public static final String  IPC_SERVER_LISTEN_QUEUE_SIZE_KEY =
     "ipc.server.listen.queue.size";
@@ -226,7 +226,7 @@ public class CommonConfigurationKeysPublic {
   public static final String  IPC_SERVER_TCPNODELAY_KEY =
     "ipc.server.tcpnodelay";
   /** Default value for IPC_SERVER_TCPNODELAY_KEY */
-  public static final boolean IPC_SERVER_TCPNODELAY_DEFAULT = false;
+  public static final boolean IPC_SERVER_TCPNODELAY_DEFAULT = true;
 
   /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
   public static final String  HADOOP_RPC_SOCKET_FACTORY_CLASS_DEFAULT_KEY =

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

@@ -807,25 +807,6 @@ for ldap providers in the same way as above does.
   </description>
 </property>
 
-<property>
-  <name>ipc.server.tcpnodelay</name>
-  <value>false</value>
-  <description>Turn on/off Nagle's algorithm for the TCP socket connection on 
-  the server. Setting to true disables the algorithm and may decrease latency
-  with a cost of more/smaller packets. 
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.tcpnodelay</name>
-  <value>false</value>
-  <description>Turn on/off Nagle's algorithm for the TCP socket connection on 
-  the client. Setting to true disables the algorithm and may decrease latency
-  with a cost of more/smaller packets. 
-  </description>
-</property>
-
-
 <!-- Proxy Configuration -->
 
 <property>