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https://issues.apache.org/jira/browse/HADOOP-12611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038222#comment-15038222
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Wei-Chiu Chuang commented on HADOOP-12611:
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Thanks Robert for the explanation!
There does exist the issue with talking to ZK before connection is created, but
that does not seem to cause the test failure. I have added blockUntilConnected
previously but which did not resolve the issue. Although it seems to be an
issue in the real world.
The root cause of this issue is, in the test, three ZKSignerSecretProvider are
initialized and get secret. By the time the third one finishes initialization,
rollSecret() has been called to update the state of secret, both locally and
remotely on the ZK server. However, the test code assumed the initialization is
instantaneous, and that it can inspect the initial state of secret
(currentSecret[1] == null) right after the three ZKSignerSecretProvider are
initialized.
The 001 patch did not pass the test, which is why I proposed the second patch,
which passed on my local machine. But I'd agree 002 patch lost the randomness.
> TestZKSignerSecretProvider#testMultipleInit occasionally fail
> -------------------------------------------------------------
>
> Key: HADOOP-12611
> URL: https://issues.apache.org/jira/browse/HADOOP-12611
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Attachments: HADOOP-12611.001.patch, HADOOP-12611.002.patch
>
>
> https://builds.apache.org/job/Hadoop-Common-trunk/2053/testReport/junit/org.apache.hadoop.security.authentication.util/TestZKSignerSecretProvider/testMultipleInit/
> Error Message
> expected null, but was:<[B@142bad79>
> Stacktrace
> java.lang.AssertionError: expected null, but was:<[B@142bad79>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotNull(Assert.java:664)
> at org.junit.Assert.assertNull(Assert.java:646)
> at org.junit.Assert.assertNull(Assert.java:656)
> at
> org.apache.hadoop.security.authentication.util.TestZKSignerSecretProvider.testMultipleInit(TestZKSignerSecretProvider.java:149)
> I think the failure was introduced after HADOOP-12181
> This is likely where the root cause is:
> 2015-11-29 00:24:33,325 ERROR ZKSignerSecretProvider - An unexpected
> exception occurred while pulling data fromZooKeeper
> java.lang.IllegalStateException: instance must be started before calling this
> method
> at
> com.google.common.base.Preconditions.checkState(Preconditions.java:145)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.getData(CuratorFrameworkImpl.java:363)
> at
> org.apache.hadoop.security.authentication.util.ZKSignerSecretProvider.pullFromZK(ZKSignerSecretProvider.java:341)
> at
> org.apache.hadoop.security.authentication.util.ZKSignerSecretProvider.rollSecret(ZKSignerSecretProvider.java:264)
> at
> org.apache.hadoop.security.authentication.util.ZKSignerSecretProvider$$EnhancerByMockitoWithCGLIB$$575f06d8.CGLIB$rollSecret$2(<generated>)
> at
> org.apache.hadoop.security.authentication.util.ZKSignerSecretProvider$$EnhancerByMockitoWithCGLIB$$575f06d8$$FastClassByMockitoWithCGLIB$$6f94a716.invoke(<generated>)
> at org.mockito.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:216)
> at
> org.mockito.internal.creation.AbstractMockitoMethodProxy.invokeSuper(AbstractMockitoMethodProxy.java:10)
> at
> org.mockito.internal.invocation.realmethod.CGLIBProxyRealMethod.invoke(CGLIBProxyRealMethod.java:22)
> at
> org.mockito.internal.invocation.realmethod.FilteredCGLIBProxyRealMethod.invoke(FilteredCGLIBProxyRealMethod.java:27)
> at
> org.mockito.internal.invocation.Invocation.callRealMethod(Invocation.java:211)
> at
> org.mockito.internal.stubbing.answers.CallsRealMethods.answer(CallsRealMethods.java:36)
> at org.mockito.internal.MockHandler.handle(MockHandler.java:99)
> at
> org.mockito.internal.creation.MethodInterceptorFilter.intercept(MethodInterceptorFilter.java:47)
> at
> org.apache.hadoop.security.authentication.util.ZKSignerSecretProvider$$EnhancerByMockitoWithCGLIB$$575f06d8.rollSecret(<generated>)
> at
> org.apache.hadoop.security.authentication.util.RolloverSignerSecretProvider$1.run(RolloverSignerSecretProvider.java:97)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
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