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ex_esdb
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ExESDB is a reincarnation of rabbitmq/khepri, specialized for use as a BEAM-native event store.
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lib/ex_esdb/hash_ring.ex
defmodule ExESDB.HashRing do
@moduledoc """
Provides functions for distributing load over the cluster.
"""
def get_node_for_stream(stream_id) do
nodes = [Node.self() | Node.list()]
hash = :erlang.phash2(stream_id, length(nodes))
Enum.at(nodes, hash)
end
def get_core_for_stream(stream_id) do
core_count = System.schedulers_online()
:erlang.phash2(stream_id, core_count)
end
end