[HADOOP-5743] Configuration: Hierachical; documented; null-safe; thread-safe

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: conf
• Release Note: Second draft will satisfy comments in 5708, but leaves questions outstanding.
• Assignee: Shevek
• Reporter: Shevek
• Created: 24/Apr/09 19:27
• Updated: 04/Jun/09 08:40

Description

Patch to configuration to:

• Update documentation to match code
• Make configurations hierarchical
• Remove global REGISTRY of configurations
• Adding global default does not reload child configurations
• (Eventually) make properly thread-safe
• Allow well-behaved overriding with nulls
• Allow future satisfaction of ticket 5708 (with which I agree, but Doug does not).

Issue Links

• is related to: HADOOP-5708 Configuration should provide a way to write only properties that have been set