See https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/234/

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[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Apache Hadoop HDFS ................................ SUCCESS [5:23.775s]
[INFO] Apache Hadoop HttpFS .............................. SUCCESS [51.087s]
[INFO] Apache Hadoop HDFS Project ........................ SUCCESS [0.060s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
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[INFO] Total time: 6:15.510s
[INFO] Finished at: Sat Apr 21 11:41:14 UTC 2012
[INFO] Final Memory: 73M/726M
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+ /home/jenkins/tools/maven/latest/bin/mvn test 
-Dmaven.test.failure.ignore=true -Pclover 
-DcloverLicenseLocation=/home/jenkins/tools/clover/latest/lib/clover.license
Archiving artifacts
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Build step 'Publish JUnit test result report' changed build result to UNSTABLE
Publishing Javadoc
Recording fingerprints
Updating HDFS-3308
Sending e-mails to: hdfs-dev@hadoop.apache.org
Email was triggered for: Unstable
Sending email for trigger: Unstable



###################################################################################
############################## FAILED TESTS (if any) 
##############################
2 tests failed.
REGRESSION:  org.apache.hadoop.hdfs.server.balancer.TestBalancer.testBalancer0

Error Message:
IPC server unable to read call parameters: readObject can't find class 
java.lang.String

Stack Trace:
java.lang.RuntimeException: IPC server unable to read call parameters: 
readObject can't find class java.lang.String
        at org.apache.hadoop.ipc.Client.call(Client.java:1088)
        at 
org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:193)
        at $Proxy11.addBlock(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:100)
        at 
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:65)
        at $Proxy11.addBlock(Unknown Source)
        at 
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1097)
        at 
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:973)
        at 
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:455)


REGRESSION:  org.apache.hadoop.hdfs.server.namenode.TestStartup.testNNRestart

Error Message:
java.net.BindException: Problem binding to [0.0.0.0:50020] 
java.net.BindException: Address already in use; For more details see:  
http://wiki.apache.org/hadoop/BindException  at 
org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:687)  at 
org.apache.hadoop.ipc.Server.bind(Server.java:231)  at 
org.apache.hadoop.ipc.Server$Listener.<init>(Server.java:313)  at 
org.apache.hadoop.ipc.Server.<init>(Server.java:1600)  at 
org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:576)  at 
org.apache.hadoop.ipc.WritableRpcEngine$Server.<init>(WritableRpcEngine.java:322)
  at 
org.apache.hadoop.ipc.WritableRpcEngine.getServer(WritableRpcEngine.java:282)  
at org.apache.hadoop.ipc.WritableRpcEngine.getServer(WritableRpcEngine.java:46) 
 at org.apache.hadoop.ipc.RPC.getServer(RPC.java:550)  at 
org.apache.hadoop.hdfs.server.datanode.DataNode.initIpcServer(DataNode.java:510)
  at 
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:689)
  at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:418)  
at 
org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1647)
  at 
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1580)
  at 
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1549)
  at 
org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:902)  
at 
org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:787)  
at 
org.apache.hadoop.hdfs.MiniDFSCluster.initMiniDFSCluster(MiniDFSCluster.java:568)
  at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:262)  at 
org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:86)  at 
org.apache.hadoop.hdfs.MiniDFSCluster$Builder.build(MiniDFSCluster.java:248)  
at 
org.apache.hadoop.hdfs.server.namenode.TestStartup.__CLR3_0_2ry930k1ee2(TestStartup.java:514)
  at 
org.apache.hadoop.hdfs.server.namenode.TestStartup.testNNRestart(TestStartup.java:486)
  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$1.protect(TestResult.java:110)  at 
junit.framework.TestResult.runProtected(TestResult.java:128)  at 
junit.framework.TestResult.run(TestResult.java:113)  at 
junit.framework.TestCase.run(TestCase.java:124)  at 
junit.framework.TestSuite.runTest(TestSuite.java:243)  at 
junit.framework.TestSuite.run(TestSuite.java:238)  at 
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)  
at 
org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)  
at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)
  at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104) 
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)  
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)  at 
org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
  at 
org.apache.maven.surefire.booter.ProviderFactory$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) 

Stack Trace:
junit.framework.AssertionFailedError: java.net.BindException: Problem binding 
to [0.0.0.0:50020] java.net.BindException: Address already in use; For more 
details see:  http://wiki.apache.org/hadoop/BindException
        at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:687)
        at org.apache.hadoop.ipc.Server.bind(Server.java:231)
        at org.apache.hadoop.ipc.Server$Listener.<init>(Server.java:313)
        at org.apache.hadoop.ipc.Server.<init>(Server.java:1600)
        at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:576)
        at 
org.apache.hadoop.ipc.WritableRpcEngine$Server.<init>(WritableRpcEngine.java:322)
        at 
org.apache.hadoop.ipc.WritableRpcEngine.getServer(WritableRpcEngine.java:282)
        at 
org.apache.hadoop.ipc.WritableRpcEngine.getServer(WritableRpcEngine.java:46)
        at org.apache.hadoop.ipc.RPC.getServer(RPC.java:550)
        at 
org.apache.hadoop.hdfs.server.datanode.DataNode.initIpcServer(DataNode.java:510)
        at 
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:689)
        at 
org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:418)
        at 
org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1647)
        at 
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1580)
        at 
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1549)
        at 
org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:902)
        at 
org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:787)
        at 
org.apache.hadoop.hdfs.MiniDFSCluster.initMiniDFSCluster(MiniDFSCluster.java:568)
        at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:262)
        at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:86)
        at 
org.apache.hadoop.hdfs.MiniDFSCluster$Builder.build(MiniDFSCluster.java:248)
        at 
org.apache.hadoop.hdfs.server.namenode.TestStartup.__CLR3_0_2ry930k1ee2(TestStartup.java:514)
        at 
org.apache.hadoop.hdfs.server.namenode.TestStartup.testNNRestart(TestStartup.java:486)
        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$1.protect(TestResult.java:110)
        at junit.framework.TestResult.runProtected(TestResult.java:128)
        at junit.framework.TestResult.run(TestResult.java:113)
        at junit.framework.TestCase.run(TestCase.java:124)
        at junit.framework.TestSuite.runTest(TestSuite.java:243)
        at junit.framework.TestSuite.run(TestSuite.java:238)
        at 
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
        at 
org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
        at 
org.apache.maven.surefire.booter.ProviderFactory$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)

        at junit.framework.Assert.fail(Assert.java:47)
        at 
org.apache.hadoop.hdfs.server.namenode.TestStartup.__CLR3_0_2ry930k1ee2(TestStartup.java:532)
        at 
org.apache.hadoop.hdfs.server.namenode.TestStartup.testNNRestart(TestStartup.java:486)
        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$1.protect(TestResult.java:110)
        at junit.framework.TestResult.runProtected(TestResult.java:128)
        at junit.framework.TestResult.run(TestResult.java:113)
        at junit.framework.TestCase.run(TestCase.java:124)
        at junit.framework.TestSuite.runTest(TestSuite.java:243)
        at junit.framework.TestSuite.run(TestSuite.java:238)
        at 
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
        at 
org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
        at 
org.apache.maven.surefire.booter.ProviderFactory$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)


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