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https://issues.apache.org/jira/browse/HADOOP-12611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15037094#comment-15037094
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Robert Kanter commented on HADOOP-12611:
----------------------------------------
I actually think the approach in the 001 patch is better. One of the things
that the test is checking is the {{ZKSignerSecretProvider}}'s logic of talking
to ZK to have all instances agree on the same secret. So there should be an
element of randomness and timing in this test, because that's what will
normally happen. Though I agree that makes the test more difficult to manage.
If my understanding is correct, it looks like the issue we see in the test is
that {{ZKSignerSecretProvider}} can start trying to talk to ZK before the
client is connected, right? In that case, I think we can easily fix that by
having the test create the Curator clients and wait for them (using
{{blockUntilConnected}}) to connect to ZK before even creating the
{{ZKSignerSecretProviders}}. You can make {{ZKSignerSecretProvider}} use an
existing Curator client by passing it from the {{ServletContext}} (see
{{getDummyServletContext()}}). That said, perhaps it would be a best to put
{{blockUntilConnected}} in {{ZKSignerSecretProvider}} itself, like your 001
patch does, or we might run into this problem in the real world?
> 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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