Steve Vaughan created HDFS-16932:
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Summary: Mockito causing ClassCastException
Key: HDFS-16932
URL: https://issues.apache.org/jira/browse/HDFS-16932
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 3.4.0
Environment: Running in the Hadoop development environment in docker,
running mvn.
Reporter: Steve Vaughan
Running tests in TestBalancerRPCDelay fails because of ClassCastExceptions
introduced by Mockito. As an example, in this stack trace note that the
RedundancyMonitor is calling "isRunning" but incorrectly ends up being routed
to getBlocks (which returns BlocksWithLocations) via TestBalancer and a Mockito
Spy. This ultimately is reported as a failure during the shutdown process.
{{Exception in thread "RedundancyMonitor" java.lang.ClassCastException:
java.lang.Boolean cannot be cast to
org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations}}{{ at
org.apache.hadoop.hdfs.server.balancer.TestBalancer$2.answer(TestBalancer.java:1865)}}{{
at
org.apache.hadoop.hdfs.server.balancer.TestBalancer$2.answer(TestBalancer.java:1858)}}{{
at
org.mockito.internal.stubbing.StubbedInvocationMatcher.answer(StubbedInvocationMatcher.java:39)}}{{
at
org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:96)}}{{
at
org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)}}{{
at
org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:35)}}{{
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:61)}}{{
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:49)}}{{
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptSuperCallable(MockMethodInterceptor.java:108)}}{{
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem$MockitoMock$1070381809.isRunning(Unknown
Source)}}{{ at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$RedundancyMonitor.run(BlockManager.java:5155)}}{{
at java.lang.Thread.run(Thread.java:750)}}
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