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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11903) test-patch should fail any new classes called Default-foo
Date Tue, 07 Jul 2015 21:21:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14617445#comment-14617445
] 

Allen Wittenauer commented on HADOOP-11903:
-------------------------------------------

bq. Well, I knew it was parsing args, but didn't know what "#*=" meant. Not easy to search
for.

Here's a good reference on how string manipulation in bash variables works.  (This is specifically
a form of substring removal.)

http://tldp.org/LDP/abs/html/string-manipulation.html

> test-patch should fail any new classes called Default-foo
> ---------------------------------------------------------
>
>                 Key: HADOOP-11903
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11903
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: yetus
>    Affects Versions: HADOOP-12111
>            Reporter: Allen Wittenauer
>            Assignee: Kengo Seki
>         Attachments: HADOOP-11903.HADOOP-12111.00.patch
>
>
> In the past, we've named things like DefaultResourceCalculator, DefaultContainerExecutor,
and DefaultCodec that do nothing but cause problems down the road since they are effectively
version and functionality locked forever.  If these examples had been named what they truly
were (e.g., MemoryResourceCalculator, SimpleContainerExecutor, and GZipCodec), the defaults
could then be changed in the future in a compatible way. 
> One way to enforce this is to prevent the creation of new classes called Default-anything.




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