[HADOOP-18803] ClassCastException in test TestRPC#testWrappedStopProxy

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Component/s: common, ipc
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: ConfX
• Created: 14/Jul/23 13:33
• Updated: 14/Sep/23 21:08

Description

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.

Buggy code:

In TestRPC.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);
  ...
} 

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. 

Issue Links

• links to: GitHub Pull Request #6075