Configuration does not lock parameters marked final if they have no value.
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Key: HADOOP-6227
URL: https://issues.apache.org/jira/browse/HADOOP-6227
Project: Hadoop Common
Issue Type: Bug
Components: conf
Reporter: Hemanth Yamijala
A use-case: Recently, we stumbled on a bug that wanted us to disable the
feature to run a debug script in map/reduce on tasks that fail, specified by
mapred.{map|reduce}.task.debug.script. The best way of disabling it seemed to
be to set it with no value in the cluster configuration and mark it final. This
did not work, however, because the code in configuration explicitly checks if
the value is not null before adding it to the list of final parameters.
Without an ability to do this, there might be a need to explicitly have a
special way of disabling optional features.
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