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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7287) Configuration deprecation mechanism doesn't work properly for GenericOptionsParser/Tools
Date Wed, 18 May 2011 18:48:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035575#comment-13035575
] 

Aaron T. Myers commented on HADOOP-7287:
----------------------------------------

bq. I think since this is such a central part of the code, we should make sure to run the
HDFS and MR tests against the patched Common jar. Would you mind doing that and posting results?

Happy to. This is presently underway.

> Configuration deprecation mechanism doesn't work properly for GenericOptionsParser/Tools
> ----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7287
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7287
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: conf
>    Affects Versions: 0.22.0, 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>            Priority: Blocker
>             Fix For: 0.22.0, 0.23.0
>
>         Attachments: hadoop-7287-testcase.txt, hadoop-7287-trunk.0.patch
>
>
> For example, you can't use -D options on the "hadoop fs" command line in order to specify
the deprecated names of configuration options. The issue is that the ordering is:
> - JVM starts
> - GenericOptionsParser creates a Configuration object and calls set() for each of the
options specified on command line
> - DistributedFileSystem or other class eventually instantiates HdfsConfiguration which
adds the deprecations
> - Some class calls conf.get("new key") and sees the default instead of the version set
on the command line

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