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https://issues.apache.org/jira/browse/HADOOP-18803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17765284#comment-17765284
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ASF GitHub Bot commented on HADOOP-18803:
-----------------------------------------
teamconfx opened a new pull request, #6075:
URL: https://github.com/apache/hadoop/pull/6075
### Description of PR
https://issues.apache.org/jira/browse/HADOOP-18803
This PR adds an extra setting of protocol engine to ensure that when running
the test by itself the test would not fail due to wrong conf.
### How was this patch tested?
Run `TestRPC#testWrappedStopProxy` and the test passes by itself.
### 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?
> ClassCastException in test TestRPC#testWrappedStopProxy
> -------------------------------------------------------
>
> Key: HADOOP-18803
> URL: https://issues.apache.org/jira/browse/HADOOP-18803
> Project: Hadoop Common
> Issue Type: Bug
> Components: common, ipc
> Reporter: ConfX
> Priority: Critical
> Attachments: reproduce.sh
>
>
> h2. What happened:
> In HCommon, test TestRPC#testWrappedStopProxy tries to cast
> org.apache.hadoop.ipc.WritableRpcEngine$Invoker to
> org.apache.hadoop.ipc.TestRPC$StoppedInvocationHandler and causes
> ClassCastException.
> h2. Buggy code:
> In TestRPC.java:
> {code:java}
> @Test
> public void testWrappedStopProxy() throws IOException {
> StoppedProtocol wrappedProxy = RPC.getProxy(StoppedProtocol.class,
> StoppedProtocol.versionID, null, conf);
> StoppedInvocationHandler invocationHandler = (StoppedInvocationHandler)
> // <--- Here causes ClassCastException
> Proxy.getInvocationHandler(wrappedProxy);
> ...
> } {code}
> h2. How to reproduce:
> (1) Just directly run test TestRPC#testWrappedStopProxy.
> You can use the reproduce.sh in the attachment to easily reproduce the bug.
> We are happy to provide a patch if this issue is confirmed.
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