You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2016/03/13 18:40:33 UTC
[jira] [Created] (HBASE-15452) Consider removing checkScanOrder
from StoreScanner.next
Lars Hofhansl created HBASE-15452:
-------------------------------------
Summary: Consider removing checkScanOrder from StoreScanner.next
Key: HBASE-15452
URL: https://issues.apache.org/jira/browse/HBASE-15452
Project: HBase
Issue Type: Bug
Reporter: Lars Hofhansl
In looking why we spent so much time in StoreScanner.next when doing a simple Phoenix count\(*) query I came across checkScanOrder. Not only is this a function dispatch (that the JIT would eventually inline), it also requires setting the prevKV member for every Cell encountered.
Removing that logic a yields measurable end-to-end improvement of 5-20% (in 0.98).
I will repeat this test on my work machine tomorrow.
I think we're stable enough to remove that check anyway.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)