Provide method to determine if a deprecated key was set in the config file
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Key: HADOOP-6252
URL: https://issues.apache.org/jira/browse/HADOOP-6252
Project: Hadoop Common
Issue Type: Improvement
Components: conf
Affects Versions: 0.21.0
Reporter: Jakob Homan
Assignee: Jakob Homan
HADOOP-6105 provided a method to deprecate config keys and transparently refer
to the new key. However, it didn't provide a method to see if the deprecated
key had been used in the config file. This is useful when, if the deprecated
key had been used, its value needs to be converted before use, for instance
when we changed the umask format. A method like "boolean
wasDeprecatedKeySet()" would be great. Patch shortly.
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