[ https://issues.apache.org/jira/browse/KYLIN-3656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16687719#comment-16687719 ]
ASF GitHub Bot commented on KYLIN-3656: --------------------------------------- asfgit commented on issue #345: KYLIN-3656 Improve HLLCounter performance URL: https://github.com/apache/kylin/pull/345#issuecomment-438981954 Can one of the admins verify this patch? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > Improve HLLCounter performance > ------------------------------ > > Key: KYLIN-3656 > URL: https://issues.apache.org/jira/browse/KYLIN-3656 > Project: Kylin > Issue Type: Improvement > Affects Versions: all > Reporter: Chang chen > Assignee: Chang chen > Priority: Major > Fix For: v2.6.0 > > Attachments: 0001-KYLIN-3656-Improve-HLLCounter-performance.patch, > image-2018-11-05-18-15-36-463.png > > > The current HLLCounter implementation has some room to improve performance, > as we find in our product environment. > # Create HLLCounter from another HLLCounter, we can copy register instead > of merge > # To compute harmonic mean in the HLLCSnapshot, we could > ## using table to cache all 1/2^r without computing on the fly > ## remove floating addition by using integer addition in the bigger loop > ## remove branch, e.g. needn't checking whether registers[i] is zero or not, > although this is minor improvement. -- This message was sent by Atlassian JIRA (v7.6.3#76005)