[HADOOP-10811] Allow classes to be reloaded at runtime

• Type: New Feature
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.0.0-alpha1
• Component/s: conf
• Assignee: Chris Li
• Reporter: Chris Li
• Created: 10/Jul/14 03:29
• Updated: 12/May/16 18:21

Description

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)

Sub-Tasks

• Refactor class creation logic in Configuration into nested class: Patch Available
• Allow user to reload classes: Open