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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6105) Provide a way to automatically handle backward compatibility of deprecated keys
Date Thu, 25 Jun 2009 09:53:07 GMT
Provide a way to automatically handle backward compatibility of deprecated keys
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                 Key: HADOOP-6105
                 URL: https://issues.apache.org/jira/browse/HADOOP-6105
             Project: Hadoop Common
          Issue Type: Improvement
          Components: conf
            Reporter: Hemanth Yamijala


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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