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From "Shaofeng SHI (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KYLIN-3656) Improve HLLCounter performance
Date Thu, 01 Nov 2018 08:43:00 GMT

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

Shaofeng SHI updated KYLIN-3656:
--------------------------------
    Fix Version/s: v2.6.0

> 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
>             Fix For: v2.6.0
>
>         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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