org.apache.spark.streaming.examples

TwitterAlgebirdHLL

object TwitterAlgebirdHLL

Illustrates the use of the HyperLogLog algorithm, from Twitter's Algebird library, to compute a windowed and global estimate of the unique user IDs occurring in a Twitter stream.

This blog post and this blog post have good overviews of HyperLogLog (HLL). HLL is a memory-efficient datastructure for estimating the cardinality of a data stream, i.e. the number of unique elements.

Algebird's implementation is a monoid, so we can succinctly merge two HLL instances in the reduce operation.

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