Comments (2)
josevalim
commented on September 27, 2024
1
You should use GenStage.demand(producer, :accumulate) or already start the producer with it set to accumulate so it doesn't emit events until the whole Flow pipeline is subscribed. Otherwise I am worried about silently ignoring "noproc" as it may hide other failures. Thanks for the report!
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sunaku
commented on September 27, 2024
Wonderful! 🎉 Setting that :accumulate flag on GenStage.demand solved the problem. 👍 Thanks.
iex(4)> {:ok, producer} = GenStage.from_enumerable(1..3, link: false); GenStage.demand(producer, :accumulate); Flow.from_stages([producer], stages: 1) |> Flow.partition(stages: 3) |> Flow.map(fn i -> ms = :timer.seconds(i); IO.inspect("#{inspect(self)}: sleep #{i}"); Process.sleep(ms); ms end) |> Enum.to_list()
"#PID<0.1107.0>: sleep 2"
"#PID<0.1108.0>: sleep 1"
"#PID<0.1108.0>: sleep 3"
[2000, 1000, 3000]from flow.
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