[HBASE-14539] Slight improvement of StoreScanner.optimize

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.2.0, 1.3.0, 0.98.15, 1.0.3, 1.1.3, 2.0.0
• Component/s: Performance, Scanners
• Hadoop Flags: Reviewed
• Assignee: Lars Hofhansl
• Reporter: Lars Hofhansl
• Created: 02/Oct/15 06:02
• Updated: 27/Jan/16 15:28
• Resolved: 03/Oct/15 03:30

Description

While looking at the code I noticed that StoreScanner.optimize does not some unnecessary work. This is a very tight loop and even just looking up a reference can throw off the CPUs cache lines. This does safe a few percent of performance (not a lot, though).