Scott Wegner created BEAM-745:
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             Summary: Display Data fails on transforms with nested components 
of the same type
                 Key: BEAM-745
                 URL: https://issues.apache.org/jira/browse/BEAM-745
             Project: Beam
          Issue Type: Bug
            Reporter: Scott Wegner
            Assignee: Scott Wegner


Display Data supports the notion of "sub components", components within a 
transform class which can contribute their own display data. We add a namespace 
to display data items based on the originating component, which keeps the 
display data items unique within the step.

There are instances where a component is included multiple times within a step. 
We handle the case of the same instance being shared by simply ignoring it the 
second time. However, we don't handle the case of a separate instance being 
added of the same class. Currently the separate instances will add display data 
with the same namespace and key, causing a failure.

This can come up for example when infrastructure at different levels wrap and 
re-wrap a component. We saw this with a bounded source being adapted multiple 
times, Bounded -> Unbounded -> Bounded -> Unbounded. The 
BoundedToUnboundedSourceAdapter was included multiple times with separate 
instances and caused a failure while populating display data.

See: https://github.com/apache/incubator-beam/pull/1088 for a failing test case.



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