[jira] [Assigned] (KYLIN-1832) HyperLogLog speed is too slow in encode and decode

["XIE FAN (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

XIE FAN reassigned KYLIN-1832:
------------------------------

    Assignee: XIE FAN  (was: fengYu)

> HyperLogLog speed is too slow in encode and decode
> --------------------------------------------------
>
>                 Key: KYLIN-1832
>                 URL: https://issues.apache.org/jira/browse/KYLIN-1832
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Metadata
>    Affects Versions: v1.3.0, v1.5.2
>            Reporter: fengYu
>            Assignee: XIE FAN
>         Attachments: HyperLogLogPlusCounter.java
>
>
> We have a cube with more than ten distinct count measure, and use hll15 store the value, we found it is too slow of HyperLogLogPlusCounter, there are three methods will called frequentlly: merge/writeRegisters/readRegisters.
> I found in kylin-1.5.x add a parameter 'singleBucket' to store the only one bucket which can optimize base cuboid.
> However, in other step of cuboid building, it will slow down. I has modify the code to speed up the speed of three operation.



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