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Returns the probabilistic cardinality of a HyperLogLog data structure, or of the merged HyperLogLog structures if more than 1 is provided (see pfadd).

[Redis documentation]

pfcount(keys, [options], callback)

Arguments Type Description
keys string List of HyperLogLog key identifiers
options JSON Object Optional parameters
callback function Callback


Option Type Description Default
queuable boolean Make this request queuable or not true

Callback Response

Returns an integer containing the aggregated probabilistic cardinality of HyperLogLog structures.


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// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.pfcount(['key1', 'key2', '...'], function (err, count) {
  // callback called once the action has completed
// Using promises (NodeJS only)
kuzzle.memoryStorage.pfcountPromise(['key1', 'key2', '...'])
  .then(count => {
    // resolved once the action has completed

Callback response:

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