Stephan Ewen created FLINK-2067:
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             Summary: Chained streaming operators should not throw chained 
exceptions
                 Key: FLINK-2067
                 URL: https://issues.apache.org/jira/browse/FLINK-2067
             Project: Flink
          Issue Type: Bug
          Components: Streaming
            Reporter: Stephan Ewen


The exceptions that come from chained operators have an non-intuitive chaining 
structure, that makes the stack traces harder to understand.

For every chained task, there is a "Failed to forward record" exception, before 
the actual exception comes as a cause.

In the Batch API, we use a special "ExceptionInChainedStubException" that is 
recognized and un-nested to make chained operator exceptions surface as root 
exceptions. 

We should do the same for the streaming API.





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