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https://issues.apache.org/jira/browse/HADOOP-18814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17765295#comment-17765295
]
ASF GitHub Bot commented on HADOOP-18814:
-----------------------------------------
teamconfx opened a new pull request, #6076:
URL: https://github.com/apache/hadoop/pull/6076
### Description of PR
https://issues.apache.org/jira/browse/HADOOP-18814
This PR adds a check before casting to RemoteException to avoid hiding the
actual exception.
### How was this patch tested?
(1) Set hadoop.security.authentication to kerberos
(2) Run test TestRPC#testReaderExceptions
The test throws the actual exception stating that "Client cannot
authenticate via:[KERBEROS]".
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> 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:
> {code:java}
> @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 RemoteException
> assertEquals(reqName, expectedIOE, re.unwrapRemoteException());
> } {code}
> h2. How to reproduce:
> (1) Set {{hadoop.security.authentication}} to {{kerberos}}
> (2) Run test {{TestRPC#testReaderExceptions}}
> h2. Stack trace:
> {code:java}
> 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.had
> oop.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) {code}
> 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:
> {code:java}
> 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");
> }
> } {code}
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