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https://issues.apache.org/jira/browse/FLINK-15504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17025701#comment-17025701
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Maximilian Michels commented on FLINK-15504:
--------------------------------------------
I think it is worth including a note in the release notes. It's not a breaking
change but it has been an annoyance to production users, so we should do our
best to inform them.
> Flink suppresses stdout/stderr during JobGraph generation from JAR
> ------------------------------------------------------------------
>
> Key: FLINK-15504
> URL: https://issues.apache.org/jira/browse/FLINK-15504
> Project: Flink
> Issue Type: Bug
> Components: Client / Job Submission
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.10.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Flink uses the {{OptimizerPlanEnvironment}} which replaces stdout/stderr
> during job graph creation. This was intended only for previewing the plan,
> but other parts of Flink, e.g. the Rest API have started to use this code as
> well.
> It may be acceptable to suppress output during plan preview, but we should
> not suppress the output during execution, e.g. via the REST API.
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