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https://issues.apache.org/jira/browse/FLINK-21570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17306143#comment-17306143
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Chesnay Schepler commented on FLINK-21570:
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Because technically you cannot add methods to {{@Public}} interfaces; it would
break all implementation.
Adding PublicEvolving does that too, but it also effectively results in this
addition being ignored. (the alternative being an explicit ignore in our
japicmp configuration)
> Add Job ID to RuntimeContext
> ----------------------------
>
> Key: FLINK-21570
> URL: https://issues.apache.org/jira/browse/FLINK-21570
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Task
> Reporter: Roman Khachatryan
> Assignee: Roman Khachatryan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.13.0
>
>
> (the issue added retroactively after the PR was merged for reference)
>
> There are some cases (e.g.
> [1|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/How-to-get-flink-JobId-in-runtime-td36756.html],
> 2) when job ID needs to be accessed from the user code (function).
> Existing workarounds doesn't look clean (reliable).
>
> One solution discussed offline is to add {{Optional<JobID>}} to the
> {{RuntimeContext}} (the latter already contains some information of the same
> level, such as subtask index).
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