[HDFS-7213] processIncrementalBlockReport performance degradation

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.7.0, 2.6.1, 3.0.0-alpha1
• Component/s: namenode
• Labels: 2.6.1-candidate
• Target Version/s: 2.7.0
• Hadoop Flags: Reviewed
• Assignee: Eric Payne
• Reporter: Daryn Sharp
• Created: 08/Oct/14 19:44
• Updated: 30/Aug/16 01:41
• Resolved: 28/Oct/14 19:56

Description

BlockManager#processIncrementalBlockReport has a debug line that is missing a isDebugEnabled check. The write lock is being held. Coupled with the increase in incremental block reports from receiving blocks, under heavy load this log line noticeably degrades performance.