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Lars Hofhansl commented on HBASE-24742: --------------------------------------- Upon second thought. Perhaps a seek (not a reseek, but a seek that could actually goes backwards) could make it so that previousIndexedKey and nextIndexedKey are accidentally the same and we *still* would have to do the compare. In my test the majority of the improvement came from the first change. > Improve performance of SKIP vs SEEK logic > ----------------------------------------- > > Key: HBASE-24742 > URL: https://issues.apache.org/jira/browse/HBASE-24742 > Project: HBase > Issue Type: Bug > Components: Performance, regionserver > Affects Versions: 3.0.0-alpha-1, 1.7.0, 2.4.0 > Reporter: Lars Hofhansl > Assignee: Lars Hofhansl > Priority: Major > Attachments: hbase-1.6-regression-flame-graph.png, > hbase-24742-branch-1.txt > > > In our testing of HBase 1.3 against the current tip of branch-1 we saw a 30% > slowdown in scanning scenarios. > We tracked it back to HBASE-17958 and HBASE-19863. > Both add comparisons to one of the tightest HBase has. > [~bharathv] -- This message was sent by Atlassian Jira (v8.3.4#803005)