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https://issues.apache.org/jira/browse/HADOOP-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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V.V.Chaitanya Krishna updated HADOOP-6105:
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Attachment: HADOOP-6105-9.patch
Uploading patch with the above comments implemented.
The warning message will be printed for every set and also for first get of
deprecated key after every reload of configuration.
> 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
> Assignee: V.V.Chaitanya Krishna
> Attachments: HADOOP-6105-1.patch, HADOOP-6105-2.patch,
> HADOOP-6105-3.patch, HADOOP-6105-4.patch, HADOOP-6105-5.patch,
> HADOOP-6105-6.patch, HADOOP-6105-7.patch, HADOOP-6105-8.patch,
> HADOOP-6105-9.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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