new

# File activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb, line 868
      def initialize
        # These caches are keyed by spec.name (ConnectionSpecification#name).
        @owner_to_pool = Concurrent::Map.new(initial_capacity: 2) do |h, k|
          h[k] = Concurrent::Map.new(initial_capacity: 2)
        end
      end