HDFS-5003. Merging change r1504354 from branch-2.1-beta to branch-2.1.0-beta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1.0-beta@1504355 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -426,6 +426,9 @@ Release 2.1.0-beta - 2013-07-02
     HDFS-4943. WebHdfsFileSystem does not work when original file path has
     encoded chars.  (Jerry He via szetszwo)
 
+    HDFS-5003. TestNNThroughputBenchmark failed caused by existing directories.
+    (Xi Fang via cnauroth)
+
   BREAKDOWN OF HDFS-347 SUBTASKS AND RELATED JIRAS
 
     HDFS-4353. Encapsulate connections to peers in Peer and PeerServer classes.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java

@@ -121,7 +121,7 @@ public class NNThroughputBenchmark {
     File excludeFile = new File(config.get(DFSConfigKeys.DFS_HOSTS_EXCLUDE,
       "exclude"));
     if(!excludeFile.exists()) {
-      if(!excludeFile.getParentFile().mkdirs())
+      if(!excludeFile.getParentFile().exists() && !excludeFile.getParentFile().mkdirs())
         throw new IOException("NNThroughputBenchmark: cannot mkdir " + excludeFile);
     }
     new FileOutputStream(excludeFile).close();