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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