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https://issues.apache.org/jira/browse/HDFS-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17022708#comment-17022708
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Ahmed Hussein commented on HDFS-14757:
--------------------------------------
[~ayushtkn], I cannot reproduce the error in the original description, and the
line numbers in the stack trace do not match the trunk (I tried to compare with
history).
However, testBalancerRPCDelay fails intermittently with the stack trace I added
earlier.
> TestBalancerRPCDelay.testBalancerRPCDelay failed
> ------------------------------------------------
>
> Key: HDFS-14757
> URL: https://issues.apache.org/jira/browse/HDFS-14757
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Reporter: Wei-Chiu Chuang
> Assignee: Ahmed Hussein
> Priority: Major
> Attachments: HDFS-14757.001.patch
>
>
> {noformat}
> Error Message
> Unfinished stubbing detected here:
> -> at
> org.apache.hadoop.hdfs.server.balancer.TestBalancer.spyFSNamesystem(TestBalancer.java:1948)
> E.g. thenReturn() may be missing.
> Examples of correct stubbing:
> when(mock.isOk()).thenReturn(true);
> when(mock.isOk()).thenThrow(exception);
> doThrow(exception).when(mock).someVoidMethod();
> Hints:
> 1. missing thenReturn()
> 2. although stubbed methods may return mocks, you cannot inline mock
> creation (mock()) call inside a thenReturn method (see issue 53)
> Stacktrace
> org.mockito.exceptions.misusing.UnfinishedStubbingException:
> Unfinished stubbing detected here:
> -> at
> org.apache.hadoop.hdfs.server.balancer.TestBalancer.spyFSNamesystem(TestBalancer.java:1948)
> E.g. thenReturn() may be missing.
> Examples of correct stubbing:
> when(mock.isOk()).thenReturn(true);
> when(mock.isOk()).thenThrow(exception);
> doThrow(exception).when(mock).someVoidMethod();
> Hints:
> 1. missing thenReturn()
> 2. although stubbed methods may return mocks, you cannot inline mock
> creation (mock()) call inside a thenReturn method (see issue 53)
> at
> org.apache.hadoop.hdfs.server.balancer.TestBalancer.spyFSNamesystem(TestBalancer.java:1957)
> at
> org.apache.hadoop.hdfs.server.balancer.TestBalancer.doTest(TestBalancer.java:811)
> at
> org.apache.hadoop.hdfs.server.balancer.TestBalancer.testBalancerRPCDelay(TestBalancer.java:1976)
> at
> org.apache.hadoop.hdfs.server.balancer.TestBalancerRPCDelay.testBalancerRPCDelay(TestBalancerRPCDelay.java:30)
> 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$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> {noformat}
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