[HADOOP-13399] deprecate the Configuration classloader

• Type: Sub-task
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Component/s: util
• Assignee: Sangjin Lee
• Reporter: Sangjin Lee
• Created: 21/Jul/16 19:23
• Updated: 21/Jul/16 22:02

Description

Today, anyone can simply call Configuration.setClassLoader() to set the configuration classloader to any arbitrary classloader. This classloader is then used to get a class or a resource through Configuration (getClass() and getResource()).

In essence, the Configuration classloader is effectively a globally shared classloader without contract. This is one step worse than TCCL in that regard.

I propose to remove/deprecate setClassLoader() and getClassLoader() and simply use TCCL (and then the classloader that loaded the Configuration class) to load classes and resources.