HADOOP-8978. TestHttpServer fails on Windows. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-trunk-win@1404878 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.branch-trunk-win.txt

@@ -36,3 +36,5 @@ branch-trunk-win changes - unreleased
   test suites to fail. (Chris Nauroth via suresh)
 
   HADOOP-8978. TestTrash fails on Windows. (Chris Nauroth via suresh)
+
+  HADOOP-8978. TestHttpServer fails on Windows. (Chris Nauroth via suresh)

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

@@ -60,6 +60,7 @@ import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
 import org.apache.hadoop.security.authorize.AccessControlList;
 import org.apache.hadoop.security.ssl.SSLFactory;
 import org.apache.hadoop.util.ReflectionUtils;
+import org.apache.hadoop.util.Shell;
 import org.mortbay.io.Buffer;
 import org.mortbay.jetty.Connector;
 import org.mortbay.jetty.Handler;
@@ -295,6 +296,13 @@ public class HttpServer implements FilterContainer {
     ret.setAcceptQueueSize(128);
     ret.setResolveNames(false);
     ret.setUseDirectBuffers(false);
+    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
+      ret.setReuseAddress(false);
+    }
     return ret;
   }