Zach Tellman - Everything Will Flow

What people said

stingraycharles · 2019-02 · Strong recommendation

Yeah this is true, typically you want to keep blocking functions outside this. By default, core.async allocates as many threads as cores in your CPU. In addition to this, I personally find core.async to deal poorly with flow control (e.g. slow subscribers slowing down the entire flow for every subscriber), and seems to not have a lot of telemetry / it’s difficult to find out what’s going on in the thread pool behind it. I’ve personally settled on Zach Tellman’s Manifold library, which provides a much more sane abstraction and is fully compatible with core.async. For some addition thought and material on these topics, I highly recommend watching this talk by Zach, “Everything Will Flow” [VIDEO]

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lkrubner · 2017-08 · Recommendation

No. Check out this video by Zach Tellman. He talks about queues and how they break down under load. One of the least intuitive things he points out is that when you have more processors, the breakdown tends to be more of a step function: everything is running smoothly till the moment that it isn't. [VIDEO] The point he makes arises from basic queue theory and is applicable to all kinds of systems, and how those systems react to load. It's got little to due with particular hardware and everything to do with basic math.

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susan_hall · 2016-08 · Recommendation

On dealing with backpressure, I would recommend what Zach Tellman writes about in his video "Everything will flow": [VIDEO] Tellman also tells his own adventure about a system something like this: "a system that would latch up into an overload state because in overload it would log errors at a severity high enough to force the log file to be flushed on every line" He talks about some problems he faced when writing to Amazon S3, when S3 stopped accepting requests. It's a fascinating talk.

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