[HADOOP-12052] IPC client downgrades all exception types to IOE, breaks callers trying to use them

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Target Version/s: 2.8.0
• Assignee: Brahma Reddy Battula
• Reporter: Steve Loughran
• Created: 02/Jun/15 09:07
• Updated: 30/Aug/16 01:27
• Resolved: 10/Jun/15 16:38

Description

The HADOOP-11772 cache changes mean that an exception such as UnknownHostException being raised on a Client connect is now being returned as a simple IOException, wrapping an ExecutionException, with the real exception being hidden inside that.

This breaks any application which uses the exception class in a try/catch statement so as to choose different actions depending on the failure mode. This has surfaced in the SLIDER-896 tests, but is likely to happen in production too.

Issue Links

• is broken by: HADOOP-11772 RPC Invoker relies on static ClientCache which has synchronized(this) blocks
• is depended upon by: SLIDER-896 TestClientBasicArgs.testListUnknownRM fails on Windows