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If you are counting something dynamic, and you are not concerned about retrieving the actual value, have you considered using a sketch? https://druid.apache.org/docs/latest/development/extensions-core/datasketches-hll.html

Hi @Kyle Hoondert we can tolerate certain level of error, however I’m not sure I understand how sketches are answer my need I mean I need simple counters and not some unique distinct counters, so why to use sketches? my problem is that number of “keys” in dictionary of counters is not known beforehead and I can’t define static schema for those “keys”

Ah - ok - I misunderstood. Are you looking at the narrow in a narrow vs wide (https://en.wikipedia.org/wiki/Wide_and_narrow_data ) scenario?

ok, I understand, thanks! this means that I need to model key to be part of dimension