Configuration deprecation logic breaks backwards compatibility
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Key: HADOOP-8167
URL: https://issues.apache.org/jira/browse/HADOOP-8167
Project: Hadoop Common
Issue Type: Bug
Components: conf
Affects Versions: 0.24.0, 0.23.3
Reporter: Alejandro Abdelnur
Assignee: Alejandro Abdelnur
Priority: Blocker
Fix For: 0.23.3
The deprecated Configuration logic works as follows:
For a dK deprecated key in favor of nK:
* on set(dK, V), it stores (nK,V)
* on get(dK) it does a reverseLookup of dK to nK and looks for get(nK)
While this works fine for single set/get operations, the iterator() method that
returns an iterator of all config key/values, returns only the new keys.
This breaks applications that did a set(dK, V) and expect, when iterating over
the configuration to find (dK, V).
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