[jira] [Created] (BEAM-4175) exec.Invoke: panic: index out of range

[Cody Schroeder (JIRA)]

Cody Schroeder created BEAM-4175:
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             Summary: exec.Invoke: panic: index out of range
                 Key: BEAM-4175
                 URL: https://issues.apache.org/jira/browse/BEAM-4175
             Project: Beam
          Issue Type: Bug
          Components: sdk-go
            Reporter: Cody Schroeder
            Assignee: Henning Rohde


Executing a pipeline with a ProcessElement method having the following 
signature will cause a runtime "index out of range" panic:

{{func (d *doSomething) ProcessElement(key int, e func(*[]byte) bool) (int, 
error) {}}

Changing the signature to have an emit function resolves the runtime panic:

{{func (d *doSomething) ProcessElement(key int, e func(*[]byte) bool, emit 
func(int)) error {}}

 

The panic is 100% reproducible with 
[beam_err.go|[https://gist.github.com/schroederc/d90db7dbcd43c94bc59ba7b64fd9ca3e].]

 

I believe the function signature causing the panic is valid (and the panic is 
the bug), but if that's not the case, then the bug would be the late panic (vs. 
during beam type checking).



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