[HADOOP-12822] Change "Metrics intern cache overflow" log level from WARN to INFO

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: metrics
• Labels: newbie
• Hadoop Flags: Reviewed
• Assignee: Andras Bokor
• Reporter: Akira Ajisaka
• Created: 18/Feb/16 16:52
• Updated: 30/Aug/16 01:18
• Resolved: 14/Apr/16 02:05

Description

Interns.java outputs "Metrics intern cache over flow" warn log for metrics info/tag when the cache reaches the hard-coded limit and the oldest cache is discarded for the first time. I'm thinking this log level can be changed to info because

• there is no problem when the oldest cache is removed. if the metrics info/tag is not in the cache, simply create it.
• we cannot configure the maximum size of the cache, so there is no way to stop the warn log.

Issue Links

• relates to: HADOOP-13033 Add missing Javadoc enries to Interns.java