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Posted to issues@kylin.apache.org by GitBox <gi...@apache.org> on 2018/11/15 09:51:20 UTC

[GitHub] hit-lacus opened a new pull request #345: KYLIN-3656 Improve HLLCounter performance

hit-lacus opened a new pull request #345: KYLIN-3656  Improve HLLCounter performance
URL: https://github.com/apache/kylin/pull/345
 
 
   The current HLLCounter implementation has some room to improve performance, as we find in our product environment. Improvement related to getCountEstimate of HLLCounter and constructor of HLLCounter.
   
   
   - Create HLLCounter from another HLLCounter, we can copy register(using System.arraycopy) instead of merge. (Constructor of HLLCounter)
   - Precompute harmonic mean in the HLLCSnapshot to avoid doing this on the fly. (getCountEstimate of HLLCounter)
   
   UnitTest has add cost duration compare.

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