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https://issues.apache.org/jira/browse/HADOOP-11875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15853583#comment-15853583
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Akira Ajisaka commented on HADOOP-11875:
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Thanks [[email protected]] for the comment.
bq. Would it be possible for this patch to retain the _ but deprecate it, so
that old code works, but people get told off? We could do that in 2.9 too, so
you can do code that works there, & maybe remove it in trunk
Probably it's possible. I can
* Keep the existing Hamlet code as-is and deprecate it.
* Create a new Hamlet classes using '__'.
bq. hamlet has to be considered something used downstream.
I don't think the API is used by the downstream projects because the package is
{{@InterfaceAudience.LimitedPrivate(\{"YARN", "MapReduce"\})}}. Therefore I'm
think we can simply rename '_'.
> [JDK9] Renaming _ as a one-character identifier to another identifier
> ---------------------------------------------------------------------
>
> Key: HADOOP-11875
> URL: https://issues.apache.org/jira/browse/HADOOP-11875
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Tsuyoshi Ozawa
> Assignee: Akira Ajisaka
> Labels: webapp
> Attachments: build_error_dump.txt, HADOOP-11875.01.patch
>
>
> From JDK9, _ as a one-character identifier is banned. Currently Web UI uses
> it. We should fix them to compile with JDK9.
> https://bugs.openjdk.java.net/browse/JDK-8061549
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