[HADOOP-14515] Specifically configure zookeeper-related log levels in KMS log4j

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.9.0, 3.0.0-alpha4, 2.8.2
• Component/s: kms
• Target Version/s: 2.8.2
• Hadoop Flags: Reviewed
• Assignee: Xiao Chen
• Reporter: Xiao Chen
• Created: 09/Jun/17 21:04
• Updated: 28/Jun/17 07:10
• Resolved: 28/Jun/17 06:49

Description

When investigating a case, we tried to turn on KMS DEBUG by setting the root logger in the log4j to DEBUG. This ends up making org.apache.zookeeper.ClientCnxn to generate 199.2M out of a 200M log file, which made the kms.log rotate very quickly.

We should keep zookeeper's log unaffected by the root logger, and only turn it on when interested.