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https://issues.apache.org/jira/browse/HADOOP-6227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Chansler updated HADOOP-6227:
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Release Note: (was: Modified configuration to allow setting final
parameters with null values.)
Editorial pass over all release notes prior to publication of 0.21. Bug.
> Configuration does not lock parameters marked final if they have no value.
> --------------------------------------------------------------------------
>
> Key: HADOOP-6227
> URL: https://issues.apache.org/jira/browse/HADOOP-6227
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Reporter: Hemanth Yamijala
> Assignee: Amareshwari Sriramadasu
> Fix For: 0.21.0
>
> Attachments: patch-6227-0.20.txt, patch-6227-ydist.txt, patch-6227.txt
>
>
> 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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