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https://issues.apache.org/jira/browse/HADOOP-14665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247502#comment-16247502
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Hari Sekhon commented on HADOOP-14665:
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Ok I didn't see that documented in the top few google hits and since it looks
like a flat unix config, hash comments were expected.
I still think supporting hash comments would be more intuitive as in management
consoles all the files which have free form configuration boxes are in unix
file format and take hashes.
> Support # hash prefix comment lines in auth_to_local mapping rules
> ------------------------------------------------------------------
>
> Key: HADOOP-14665
> URL: https://issues.apache.org/jira/browse/HADOOP-14665
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.7.3
> Environment: HDP 2.6.0 + Kerberos
> Reporter: Hari Sekhon
>
> Request to add support for # hash prefixed comment lines in Hadoop's
> auth_to_local mappings rules so I can comment what rules I've added and why
> inline to the rules like with code (useful when supporting multi-directory
> mappings).
> It should be fairly easy to implement, just string strip all lines from # to
> end, trim whitespace and then exclude all blank / whitespace lines, I do this
> in tools I write all the time.
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