[HBASE-5897] prePut coprocessor hook causing substantial CPU usage

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.92.0
• Fix Version/s: 0.92.2, 0.94.0, 0.95.0
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 29/Apr/12 02:24
• Updated: 18/Sep/13 22:15
• Resolved: 01/May/12 20:58

Description

I was running an insert workload against trunk under oprofile and saw that a significant portion of CPU usage was going to calling the "prePut" coprocessor hook inside doMiniBatchPut, even though I don't have any coprocessors installed. I ran a million-row insert and collected CPU time spent in the RS after commenting out the preput hook, and found CPU usage reduced by 33%.