fengYu created KYLIN-1832:
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Summary: 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: v1.5.2, v1.3.0
Reporter: fengYu
Assignee: fengYu
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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