Lars Hofhansl created HBASE-15452:
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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.
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