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https://issues.apache.org/jira/browse/BEAM-1777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956479#comment-15956479
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Stas Levin commented on BEAM-1777:
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[~tgroh] Since I was unable to come up with a proper test for this, would you
mind confirming it resolves the use-case you encountered?
> If PipelineEnforcement throws an exception after Pipeline.run() fails, it
> overwrites the original failure
> ---------------------------------------------------------------------------------------------------------
>
> Key: BEAM-1777
> URL: https://issues.apache.org/jira/browse/BEAM-1777
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Thomas Groh
> Assignee: Stas Levin
>
> The exception is thrown out of the finally block after the original exception
> was already thrown, and is not properly suppressed.
> If the Pipeline throws an exception in construction (including validation
> failures), this can cause {{AbandonedNodeEnforcement}} to attempt to traverse
> a {{Pipeline}} which is invalid, which throws another exception. That
> exception is improperly propagated instead of the original failure, which
> complicates debugging.
> An example is using an unkeyed input PCollection to a Stateful ParDo. The
> validation will fail, but the error message will suggest that a node has
> incompletely specified outputs (which is a consequence rather than a cause of
> having an invalid transform).
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