[jira] [Updated] (BEAM-745) Display Data fails on transforms with nested components of the same type

["Davor Bonaci (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-745?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davor Bonaci updated BEAM-745:
------------------------------
    Component/s: sdk-java-core

> 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
>          Components: sdk-java-core
>            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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