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[GitHub] [incubator-druid] leerho commented on issue #6814: [Discuss]
Replacing hyperUnique as 'default' distinct count sketch
leerho commented on issue #6814: [Discuss] Replacing hyperUnique as 'default' distinct count sketch
URL: https://github.com/apache/incubator-druid/issues/6814#issuecomment-482710359
@Dylan1312
Sorry, I didn't see your comment until just now. I would be very interested in understanding what you are observing:
- What is your configuration of the HLL sketch? What is LgK? HLL4,6,8?
- What properties are you measuring, merge time? You mention deserialization time,
- You say it is "worse"... could you report your measurements? how much slower?
- What the size of the data (# of sketch merges)
- Do you happen to know anything about the distribution of your data? Long-tail? Lots of small values? or large values?
- Are you also comparing the accuracy?
Cheers,
Lee
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