Review request for HADOOP-11875

[Akira Ajisaka <aa...@apache.org>]

Hi YARN and MapReduce developers,

I'm working for Java 9 support and created a patch to replace '_' with 
'__' in the hamlet framework (org.apache.hadoop.yarn.webapp.hamlet) used 
by YARN and MapReduce webapp. In Java 9 '_' as a one-character 
identifier is banned.

https://issues.apache.org/jira/browse/HADOOP-11875

In the patch, new package hamlet2 with '__' is created and the old 
package is kept because downstream projects are using hamlet (e.g. 
Apache Slider). And I added a setting for Java 9 not to compile the old 
package.

I'll really appreciate if you will review my patch.

Regards,
Akira

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