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https://issues.apache.org/jira/browse/BEAM-2583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082464#comment-16082464
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Thomas Groh commented on BEAM-2583:
-----------------------------------
Specifically, this only happens if, during a call to {{expand}}, the call
throws an exception; that exception is caught or otherwise handled, and then
the user attempts to continue to use the pipeline. This is very much a bug in
the user's code, but it may fail in a non-intuitive sense (i.e. via
NullPointerException)
> Exceptions in expand() corrupt the TransformHierarchy
> -----------------------------------------------------
>
> Key: BEAM-2583
> URL: https://issues.apache.org/jira/browse/BEAM-2583
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Kenneth Knowles
> Priority: Minor
>
> Discovered recently during unrelated work that when a composite PTransform
> (Java) crashes during expand - for example due to a validation failure - it
> leaves the Pipeline in a state that throws NPEs when it is traversed.
> No one has complained, so it doesn't seem critical to fix the mutation logic.
> But we should set a bit and poison all future uses of the corrupted pipeline.
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