[HBASE-14489] postScannerFilterRow consumes a lot of CPU

• Type: Bug
• Status: Closed
• Priority: Major
• 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: Coprocessors, Performance
• Labels: performance
• Hadoop Flags: Reviewed
• Assignee: Lars Hofhansl
• Reporter: Lars Hofhansl
• Created: 25/Sep/15 04:40
• Updated: 27/Jan/16 15:28
• Resolved: 26/Sep/15 23:48

Description

During an unrelated test I found that when scanning a tall table with CQ only and filtering most results at the server, 50% of time is spend in postScannerFilterRow, even though the coprocessor does nothing in that hook.

We need to find a way not to call this hook when not needed, or to question why we have this hook at all.

I think ram_krish added the hook (or maybe anoop.hbase). I am also not sure whether Phoenix uses this hook (giacomotaylor?)