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junit.framework.AssertionFailedError: Port in use: 0.0.0.0:50105	at junit.framework.Assert.fail(Assert.java:47)	at junit.framework.Assert.assertTrue(Assert.java:20)	at org.apache.hadoop.hdfs.server.namenode.TestBackupNode.testCheckpoint(TestBackupNode.java:280)	at org.apache.hadoop.hdfs.server.namenode.TestBackupNode.__CLR3_0_2odeun71e4j(TestBackupNode.java:113)	at org.apache.hadoop.hdfs.server.namenode.TestBackupNode.testCheckpointNode(TestBackupNode.java:112)	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:597)	at junit.framework.TestCase.runTest(TestCase.java:168)	at junit.framework.TestCase.runBare(TestCase.java:134)	at junit.framework.TestResult$1.protect(TestResult.java:110)	at junit.framework.TestResult.runProtected(TestResult.java:128)	at junit.framework.TestResult.run(TestResult.java:113)	at junit.framework.TestCase.run(TestCase.java:124)	at junit.framework.TestSuite.runTest(TestSuite.java:232)	at junit.framework.TestSuite.run(TestSuite.java:227)	at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)	at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:110)	at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:175)	at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcessWhenForked(SurefireStarter.java:81)	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:68)