Chris Douglas commented on YARN-4476:

bq. do you think is it better to place this module to 
org.apache.hadoop.yarn.server.resourcemanager.nodelabels.matcher (or evaluator) 
for better organization?

I thought about it, but:
# It's a (potential) internal detail of the node label implementation, with 
other classes in the package
# The {{nodelabel}} package is sparse right now
# None of these classes are user-facing, so they're easy to move

So I put in in the {{nodelabels}} package, but don't have a strong opinion.

> Matcher for complex node label expresions
> -----------------------------------------
>                 Key: YARN-4476
>                 URL: https://issues.apache.org/jira/browse/YARN-4476
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>            Reporter: Chris Douglas
>            Assignee: Chris Douglas
>         Attachments: YARN-4476-0.patch, YARN-4476-1.patch
> Implementation of a matcher for complex node label expressions based on a 
> [paper|http://dl.acm.org/citation.cfm?id=1807171] from SIGMOD 2010.

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