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Re: Advice on parallelizing network calls in DoFn

In streaming, a simple way is to add a reshuffle to increase parallelism. When you are external-call bound, extra cost of reshuffle is negligible. e.g. https://stackoverflow.com/questions/46116443/dataflow-streaming-job-not-scaleing-past-1-worker

Note that by default Dataflow workers use a couple of hundred threads as required. This can be increased with a pipeline option if you prefer. I am not sure of other runners.

On Thu, Mar 15, 2018 at 8:25 AM Falcon Taylor-Carter <falcon@xxxxxxxxxxxxxxxxxx> wrote:
Hello Pablo,

Thanks for checking up (I'm working with Josh on this problem). It seems there isn't a built-in process for this kind of use case currently, and that the best process right now is to handle our own bundling and threading in the DoFn. If you had any other suggestions, or anything to keep in mind in doing this, let us know!


On Tue, Mar 13, 2018 at 4:52 PM, Pablo Estrada <pabloem@xxxxxxxxxx> wrote:
I'd just like to close the loop. Josh, did you get an answer/guidance on how to proceed with your pipeline?
Or maybe we'll need a new thread to figure that out : )

On Fri, Mar 9, 2018 at 1:39 PM Josh Ferge <josh.ferge@xxxxxxxxxxxxxxxxxx> wrote:
Hello all:

Our team has a pipeline that make external network calls. These pipelines are currently super slow, and the hypothesis is that they are slow because we are not threading for our network calls. The github issue below provides some discussion around this:

In beam 1.0, there was IntraBundleParallelization, which helped with this. However, this was removed because it didn't comply with a few BEAM paradigms. 

Questions going forward:

What is advised for jobs that make blocking network calls? It seems bundling the elements into groups of size X prior to passing to the DoFn, and managing the threading within the function might work. thoughts?
Are these types of jobs even suitable for beam?
Are there any plans to develop features that help with this?

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