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https://issues.apache.org/jira/browse/KYLIN-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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liyang resolved KYLIN-1832.
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Resolution: Fixed
Fix Version/s: v1.6.1
> 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
> Fix For: v1.6.1
>
> Attachments:
> 0001-KYLIN-1832-HyperLogLog-performance-optimization.patch,
> 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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