HADOOP-4040. Merge -r 690640:690641 from trunk to branch 0.18.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.18@690642 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -10,6 +10,10 @@ Release 0.18.1 - Unreleased
     HADOOP-3821. Prevent SequenceFile and IFile from duplicating codecs in
     CodecPool when closed more than once. (Arun Murthy via cdouglas)
 
+    HADOOP-4040. Remove coded default of the IPC idle connection timeout
+    from the TaskTracker, which was causing HDFS client connections to not be 
+    collected. (ddas via omalley)
+
 Release 0.18.0 - 2008-08-19
 
   INCOMPATIBLE CHANGES

src/mapred/org/apache/hadoop/mapred/TaskTracker.java

@@ -2185,8 +2185,6 @@ public class TaskTracker
       int port = Integer.parseInt(args[1]);
       InetSocketAddress address = new InetSocketAddress(host, port);
       TaskAttemptID taskid = TaskAttemptID.forName(args[2]);
-      //set a very high idle timeout so that the connection is never closed
-      defaultConf.setInt("ipc.client.connection.maxidletime", 60*60*1000);
       TaskUmbilicalProtocol umbilical =
         (TaskUmbilicalProtocol)RPC.getProxy(TaskUmbilicalProtocol.class,
                                             TaskUmbilicalProtocol.versionID,