Unit test fails on Windows: org.apache.hadoop.dfs.TestDFSShell.testErrOutPut
----------------------------------------------------------------------------

                 Key: HADOOP-2942
                 URL: https://issues.apache.org/jira/browse/HADOOP-2942
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.17.0
         Environment: windows
            Reporter: Mukund Madhugiri
            Assignee: Robert Chansler
            Priority: Blocker
             Fix For: 0.17.0


Unit test fails on Windows: org.apache.hadoop.dfs.TestDFSShell.testErrOutPut

*Here are the changes:*
- HADOOP-2931. IOException thrown by DFSOutputStream had wrong stack trace in 
some cases. (Michael Bieniosek via rangadi) (detail/ViewSVN)
- HADOOP-2758. Reduce buffer copies in DataNode when data is read from HDFS, 
without negatively affecting read throughput. (rangadi) (detail/ViewSVN)
- move previous change log to the end of the section rather than the beginning 
(detail/ViewSVN)
- HADOOP-2833. Do not use "Dr. Who" as the default user in JobClient. A valid 
user name is required. (Tsz Wo (Nicholas), SZE via rangadi) (detail/ViewSVN)
- HADOOP-2809.  Fix HOD syslog config syslog-address so that it works.  
Contributed by Hemanth Yamijala. (detail/ViewSVN)
- HADOOP-2847.  Ensure idle cluster cleanup works even if the JobTracker 
becomes unresponsive to RPC calls. Contributed by Hemanth Yamijala. 
(detail/ViewSVN)
- HADOOP-2819. The following methods in JobConf are removed: getInputKeyClass() 
setInputKeyClass getInputValueClass() setInputValueClass(Class theClass) 
setSpeculativeExecution getSpeculativeExecution(). Contributed by Amareshwari 
Sri Ramadasu. (detail/ViewSVN)
- HADOOP-2820. The following classes in streaming are removed : 
StreamLineRecordReader StreamOutputFormat StreamSequenceRecordReader. 
Contributed by Amareshwari Sri Ramadasu. (detail/ViewSVN)
- HADOOP-2219. A new command "df -count" that counts the number of files and 
directories.  (Tsz Wo (Nicholas), SZE via dhruba) (detail/ViewSVN)
- HADOOP-2912. MiniDFSCluster restart should wait for namenode to exit 
safemode. This was causing TestFsck to fail.  (Mahadev Konar via dhruba) 
(detail/ViewSVN)


*Standard Error:*
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=NameNodeStatistics
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics.<init>(NameNodeStatistics.java:40)
        at org.apache.hadoop.dfs.NameNodeMetrics.<init>(NameNodeMetrics.java:69)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at 
org.apache.hadoop.dfs.TestDFSShell.testURIPaths(TestDFSShell.java:329)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=FSNamesystemStatus
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.FSNamesystem.registerMBean(FSNamesystem.java:4183)
        at org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:290)
        at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:252)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:132)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at 
org.apache.hadoop.dfs.TestDFSShell.testURIPaths(TestDFSShell.java:329)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=NameNodeStatistics
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics.<init>(NameNodeStatistics.java:40)
        at org.apache.hadoop.dfs.NameNodeMetrics.<init>(NameNodeMetrics.java:69)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at org.apache.hadoop.dfs.TestDFSShell.testText(TestDFSShell.java:415)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
text: File /texttest/file.gz does not exist.
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=NameNodeStatistics
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics.<init>(NameNodeStatistics.java:40)
        at org.apache.hadoop.dfs.NameNodeMetrics.<init>(NameNodeMetrics.java:69)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at 
org.apache.hadoop.dfs.TestDFSShell.testCopyToLocal(TestDFSShell.java:460)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
copyToLocal: null
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=NameNodeStatistics
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics.<init>(NameNodeStatistics.java:40)
        at org.apache.hadoop.dfs.NameNodeMetrics.<init>(NameNodeMetrics.java:69)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at org.apache.hadoop.dfs.TestDFSShell.testCount(TestDFSShell.java:557)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=NameNodeStatistics
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics.<init>(NameNodeStatistics.java:40)
        at org.apache.hadoop.dfs.NameNodeMetrics.<init>(NameNodeMetrics.java:69)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at 
org.apache.hadoop.dfs.TestDFSShell.testFilePermissions(TestDFSShell.java:671)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
chown: could not get status for '/nonExistentFile': File /nonExistentFile does 
not exist.
chown: could not get status for 'unknownFile': File unknownFile does not exist.
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=NameNodeStatistics
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics.<init>(NameNodeStatistics.java:40)
        at org.apache.hadoop.dfs.NameNodeMetrics.<init>(NameNodeMetrics.java:69)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at 
org.apache.hadoop.dfs.TestDFSShell.testDFSShell(TestDFSShell.java:717)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
cat: File /test/mkdirs/myFile1 does not exist.
rm: cannot remove /test/mkdirs/myFile1: No such file or directory.
cp: Cannot copy /test/dir1 to its subdirectory /test/dir1/dir2
javax.management.InstanceAlreadyExistsException: 
hadoop.dfs:service=NameNode,name=NameNodeStatistics
        at 
com.sun.jmx.mbeanserver.RepositorySupport.addMBean(RepositorySupport.java:452)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1410)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:936)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:337)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:497)
        at 
org.apache.hadoop.metrics.util.MBeanUtil.registerMBean(MBeanUtil.java:52)
        at 
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics.<init>(NameNodeStatistics.java:40)
        at org.apache.hadoop.dfs.NameNodeMetrics.<init>(NameNodeMetrics.java:69)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:177)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:163)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:866)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:264)
        at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:113)
        at org.apache.hadoop.dfs.TestDFSShell.testGet(TestDFSShell.java:959)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
        at 
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:567)
get: Checksum error: /blk_3985910936379526606:of:/test/get/testGet.txt at 0


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