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https://issues.apache.org/jira/browse/BEAM-745?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Wegner updated BEAM-745:
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Labels: backward-incompatible (was: )
> 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
> Labels: backward-incompatible
> Fix For: 0.3.0-incubating
>
>
> 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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