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https://issues.apache.org/jira/browse/HADOOP-18814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
ConfX updated HADOOP-18814:
---------------------------
Summary: Direct class cast causes ClassCastException in
TestRPC#testReaderExceptions (was: Direct class cast may cause
ClassCastException in TestRPC#testReaderExceptions)
> Direct class cast causes ClassCastException in TestRPC#testReaderExceptions
> ---------------------------------------------------------------------------
>
> Key: HADOOP-18814
> URL: https://issues.apache.org/jira/browse/HADOOP-18814
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf, ipc
> Reporter: ConfX
> Priority: Critical
> Attachments: reproduce.sh
>
>
> h2. What happened:
> Test {{TestRPC#testReaderExceptions}} assumes there is a RemoteException has
> been thrown and directly cast the root cause of {{ServiceException}} to
> {{{}RemoteException{}}}. But this cast may lead to ClassCastException when
> the root cause exception is not {{{}RemoteException{}}}.
> h2. Buggy code:
> @Test (timeout=30000)public void testReaderExceptions() throws Exception {
> ... try { FakeRequestClass.exception = doDisconnect ?
> rseFatal : rseError; proxy.ping(null, newEmptyRequest());
> fail(reqName + " didn't fail");
> } catch (ServiceException e) { RemoteException re =
> (RemoteException)e.getCause(); // <--- Here the test assumes the root
> cause is RemoteExceptionassertEquals(reqName, expectedIOE,
> re.unwrapRemoteException());
> }
> h2. How to reproduce:
> (1) Set {{hadoop.security.authentication}} to {{kerberos}}
> (2) Run test {{TestRPC#testReaderExceptions}}
> {{}}
> h2. Stack trace:
> java.lang.ClassCastException: class java.io.IOException cannot be cast to
> class org.apache.hadoop.ipc.RemoteException (java.io.IOException is in module
> java.base of loader 'bootstrap'; org.apache.hadoop.ipc.RemoteException is in
> unnamed module of loader 'app') at
> org.apache.hadoop.ipc.TestRPC.testReaderExceptions(TestRPC.java:1742)
>
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method) at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
> at
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
>
> at
> java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at java.base/java.lang.Thread.run(Thread.java:829)
>
> h2. Fix:
> A better way to do is to firstly check whether the root cause is
> RemoteException, if not, fail the test rather than causing the
> CastClassException:
> try { FakeRequestClass.exception = doDisconnect ? rseFatal : rseError;
> proxy.ping(null, newEmptyRequest()); fail(reqName + " didn't fail");
> } catch (ServiceException e) { if (e.getCause() instanceof
> RemoteException) { RemoteException re = (RemoteException)e.getCause();
> assertEquals(reqName, expectedIOE, re.unwrapRemoteException());
> } else { fail(reqName + " didn't fail with RemoteException");
> }
> }
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