fix: interceptor back-pressure #3374
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Not working yet, just a POC |
| function emitDrain (client) { | ||
| client[kNeedDrain] = 0 | ||
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| for (const callback of client[kDrainQueue].splice(0)) { |
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How does it differs from subscribing to dispatcher.on('drain')?
Sure, it is integrated as first-class-citizen, but it kind overlaps with the drain event isn't it?
If the retry interceptor wants to implement backpressure, it can handle the last value returned from dispatch, and decide what to do on the next attempt, e.g. waiting for the event or trying once more, isn't it?
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'drain' applies globally while onDrain applies to this specific request, e.g. you could have different origins that apply to different queues, so having a global drain is confusing.
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Which is why the current dispatch: boolean + drain 'event' API is slightly broken.
Tries to resolve the back-pressure issue. Downside is that it gives up on forwarding dispatcher events.
Refs: #3376