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https://issues.apache.org/jira/browse/BEAM-4440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17102223#comment-17102223
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Kenneth Knowles commented on BEAM-4440:
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The title of the bug sounds like it is referring to the entirety of
fileToStage. The comment here (which I agree with) is related. If a file is
specified, either by specific name or glob emptiness, we should fail.
> When filesToStage is empty, the DataflowRunner should fail.
> -----------------------------------------------------------
>
> Key: BEAM-4440
> URL: https://issues.apache.org/jira/browse/BEAM-4440
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Thomas Groh
> Assignee: Kenneth Knowles
> Priority: Major
>
> Staging no files will not permit any pipeline execution to succeed. This
> should cause the pipeline to fail before job submission.
>
> In general, if any file to stage is specified and expands to no files, this
> should also be a failure. Specifying a glob that represents no files is
> almost certainly user error.
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