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https://issues.apache.org/jira/browse/HADOOP-11875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15089439#comment-15089439
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Marco Zühlke commented on HADOOP-11875:
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http://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.27.1
{quote}
It is a compile-time error if a lambda parameter has the name _ (that is, a
single underscore character).
The use of the variable name _ in any context is discouraged. Future versions
of the Java programming language may reserve this name as a keyword and/or give
it special semantics.
{quote}
So for the time being only a warning.
> [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
>
> 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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