[HBASE-14524] Short-circuit comparison of rows in CellComparator

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Performance, Scanners
• Hadoop Flags: Reviewed
• Assignee: Lars Francke
• Reporter: Lars Francke
• Created: 30/Sep/15 12:10
• Updated: 01/Jul/22 21:37
• Resolved: 05/Jan/16 03:18

Description

CellComparator#compareRows compares two rows. For Scans and Gets these objects can sometimes be exactly the same object.

I see this (without fully understanding everything that's going on) for the first cell in each row.

In these circumstances I think it makes sense to short-circuit the comparison (not do a byte comparison and class cast checks) and bail out early if the objects are identical.