Sliding HyperLogLog vs HyperLogLog Series

[usman ijaz]

Hi,

I am new to these algorithms and curious about the differences between Sliding HyperLogLog vs HyperLogLog Series. I want to create thousands of counters for providing sliding window based cardinality estimation. e.g. cardinality estimate for last 30 days, last 7 days and last 24 hours. 

- Will the hyperloglog series evict/forget the older data for example in my case data older then 30 days?

- Does the size of hyperloglog series increase wit h time? For a 12 bit counter, what would be the minimum and maximum size?

I am trying to find the answers to these questions and it would be really helpful if I get a quick response. 

Thanks.

Regards,

Usman Ijaz

[Sam Ritchie]

Hey Usman,

I'm not familiar with sliding HyperLogLog, so I'm not going to be able to be of much help here. Apologies! You might try the gitter channel for questions about the hll series... or better yet, you might want to open a ticket since that'll definitely get seen by the Twitter folks and other committers.

Cheers,

Sam

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