Chen Zhang created HDFS-14677:
---------------------------------

             Summary: TestDataNodeHotSwapVolumes#testAddVolumesConcurrently 
fails intermittently in trunk
                 Key: HDFS-14677
                 URL: https://issues.apache.org/jira/browse/HDFS-14677
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Chen Zhang


Stacktrace:
{code:java}
java.lang.NullPointerException
        at 
org.apache.hadoop.hdfs.server.datanode.TestDataNodeHotSwapVolumes.testAddVolumesConcurrently(TestDataNodeHotSwapVolumes.java:615)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at 
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
        at 
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.lang.Thread.run(Thread.java:748)
{code}
see: 
[https://builds.apache.org/job/PreCommit-HDFS-Build/27328/testReport/org.apache.hadoop.hdfs.server.datanode/TestDataNodeHotSwapVolumes/testAddVolumesConcurrently/]

and 
[https://builds.apache.org/job/PreCommit-HDFS-Build/27312/testReport/org.apache.hadoop.hdfs.server.datanode/TestDataNodeHotSwapVolumes/testAddVolumesConcurrently/]



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