TestNNThroughput should not use a fixed namenode port
-----------------------------------------------------

                 Key: HADOOP-2601
                 URL: https://issues.apache.org/jira/browse/HADOOP-2601
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.15.2
            Reporter: Hairong Kuang
             Fix For: 0.16.0


TestNNThroughput failed with the following error: 
Address already in use
java.net.BindException: Address already in use
        at java.net.PlainSocketImpl.socketBind(Native Method)
        at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359)
        at java.net.ServerSocket.bind(ServerSocket.java:319)
        at java.net.ServerSocket.<init>(ServerSocket.java:185)
        at 
org.mortbay.util.ThreadedServer.newServerSocket(ThreadedServer.java:391)
        at org.mortbay.util.ThreadedServer.open(ThreadedServer.java:477)
        at org.mortbay.util.ThreadedServer.start(ThreadedServer.java:503)
        at org.mortbay.http.SocketListener.start(SocketListener.java:203)
        at org.mortbay.http.HttpServer.doStart(HttpServer.java:761)
        at org.mortbay.util.Container.start(Container.java:72)
        at 
org.apache.hadoop.mapred.StatusHttpServer.start(StatusHttpServer.java:182)
        at org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:273)
        at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:223)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:129)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:174)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:160)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:849)
        at 
org.apache.hadoop.dfs.NNThroughputBenchmark.<init>(NNThroughputBenchmark.java:57)
        at 
org.apache.hadoop.dfs.NNThroughputBenchmark.runBenchmark(NNThroughputBenchmark.java:752)
        at 
org.apache.hadoop.dfs.TestNNThroughputBenchmark.testNNThroughput(TestNNThroughputBenchmark.java:15)


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