[HDFS-3024] Improve performance of stringification in addStoredBlock

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.23.0
• Fix Version/s: 0.23.2
• Component/s: namenode
• Target Version/s: 0.23.3
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 28/Feb/12 06:00
• Updated: 16/Mar/15 18:40
• Resolved: 28/Feb/12 18:04

Description

In looking at stack traces of a NN under a heavy block allocation load (around a thousand per second) I see that a lot of time is being taken up in stringification of log messages for addStoredBlock. This code can be optimized to use a single StringBuilder instead of a lot of nested toString() calls.