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https://issues.apache.org/jira/browse/HADOOP-11875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15126543#comment-15126543
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Allen Wittenauer commented on HADOOP-11875:
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bq. In HDFS, switching from JSP to JMX + HTML5 has shown various improvement on
user experience, productivity and security.
This isn't nearly so cut and dried. We have users who refuse to update because
of the loss of features in the UI (they are sticking to 2.4.1's "legacy mode"),
never mind the destruction of long term APIs and the "tossed over the fence"
WebHDFS authentication that we had to rework to even make security function if
one was using a custom plug-in. The switch took a lot of effort to even get to
stable and it's still not what I would consider feature complete compared to
the old API. So at least our experience for both beginner and advanced users,
that update was somewhere in the middle and definitely not a solid win.
> [JDK8] 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
> Labels: newbie
> Attachments: build_error_dump.txt
>
>
> From JDK8, _ as a one-character identifier is disallowed. Currently Web UI
> uses it. We should fix them to compile with JDK8.
> https://bugs.openjdk.java.net/browse/JDK-8061549
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