[MAPREDUCE-3394] Add log guard for a debug message in ReduceTask

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 0.20.205.0
• Fix Version/s: 1.1.0
• Component/s: task
• Target Version/s: 1.1.0
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 11/Nov/11 23:05
• Updated: 17/Oct/12 18:27
• Resolved: 15/Nov/11 00:42

Description

There's a LOG.debug message in ReduceTask that stringifies a task ID and uses a non-negligible amount of CPU in some cases. We should guard it with isDebugEnabled