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From "V.V.Chaitanya Krishna (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6105) Provide a way to automatically handle backward compatibility of deprecated keys
Date Wed, 12 Aug 2009 04:20:14 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

V.V.Chaitanya Krishna updated HADOOP-6105:
------------------------------------------

    Attachment: HADOOP-6105-3.patch

uploaded patch with the following test cases being added:

1. User sets an old key and gets new key.

2. User sets a new key and gets old key.

The results should be the value which is set most recently, i.e., value corresponding to old
key in the first case and value corresponding to new key in the second case.

> Provide a way to automatically handle backward compatibility of deprecated keys
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-6105
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6105
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>            Reporter: Hemanth Yamijala
>         Attachments: HADOOP-6105-1.patch, HADOOP-6105-2.patch, HADOOP-6105-3.patch, HADOOP-6105.patch,
HADOOP-6105.patch
>
>
> There are cases when we have had to deprecate configuration keys. Use cases include,
changing the names of variables to better match intent, splitting a single parameter into
two - for maps, reduces etc.
> In such cases, we typically provide a backwards compatible option for the old keys. The
handling of such cases might typically be common enough to actually add support for it in
a generic fashion in the Configuration class. Some initial discussion around this started
in HADOOP-5919, but since the project split happened in between we decided to open this issue
to fix it in common.

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