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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6948) There's no way to remove a property from a Configuration
Date Mon, 13 Sep 2010 19:12:36 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908939#action_12908939
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Doug Cutting commented on HADOOP-6948:
--------------------------------------

> If you want to run jobs with configurations created on the fly (which is what I'm doing)
then the inability to remove properties is kind of annoying.

I don't yet fully understand the need.  I've written lots of code that creates configurations
and have never wanted to remove a property.  That said, I don't find it inconceivable that
there might be reasonable cases.  Can you perhaps humor me and elaborate a bit more how it
comes that you have properties that you need to erase?  Changing a datastructure from write-only
to read-write means that applications can less safely cache values from it.  But since Configuration
is already permits overwrites this is perhaps a non-issue.

Also, do you intend to provide a patch for this?  My instinct is that, if we were to provide
the ability to remove Configuration properties, it should be done through a 'remove' method
rather than by setting values to null.  Do you agree?

> There's no way to remove a property from a Configuration
> --------------------------------------------------------
>
>                 Key: HADOOP-6948
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6948
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 0.20.2, 0.21.0
>         Environment: all
>            Reporter: Mike Baranczak
>            Priority: Minor
>
> The Configuration class has a lot of methods for setting properties, but it's impossible
to remove a property once it's set. Trying to set it to null results in a NullPointerException,
since java.util.Properties doesn't allow null values. When building a Configuration programmatically,
this can be a problem. 

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