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Posted to issues@kylin.apache.org by "Chang chen (JIRA)" <ji...@apache.org> on 2018/11/01 07:54:00 UTC

[jira] [Updated] (KYLIN-3656) Improve HLLCounter performance

     [ https://issues.apache.org/jira/browse/KYLIN-3656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chang chen updated KYLIN-3656:
------------------------------
    Attachment: 0001-KYLIN-3656-Improve-HLLCounter-performance.patch

> 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
>            Priority: Major
>         Attachments: 0001-KYLIN-3656-Improve-HLLCounter-performance.patch
>
>
> 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.



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