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https://issues.apache.org/jira/browse/HADOOP-10811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070602#comment-14070602
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Chris Li commented on HADOOP-10811:
-----------------------------------
One thing worth discussing is also whether or not this is a useful feature, now
that HA allows for rolling restarts. Not everyone is running HA today, but it
may be encouraged to do so in the future for this ability
> Allow classes to be reloaded at runtime
> ---------------------------------------
>
> Key: HADOOP-10811
> URL: https://issues.apache.org/jira/browse/HADOOP-10811
> Project: Hadoop Common
> Issue Type: New Feature
> Components: conf
> Affects Versions: 3.0.0
> Reporter: Chris Li
> Assignee: Chris Li
> Priority: Minor
>
> Currently hadoop loads its classes and caches them in the Configuration
> class. Even if the user swaps a class's jar at runtime, hadoop will continue
> to use the cached classes when using reflection to instantiate objects. This
> limits the usefulness of things like HADOOP-10285, because the admin would
> need to restart each time they wanted to change their queue class.
> This patch is to add a way to refresh the class cache, by creating a new
> refresh handler to do so (using HADOOP-10376)
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