Determining the effectiveness of hedging
Closed this issue · 3 comments
Hey @cristaloleg
Is there a way to determine how many hedged requests actually "won" vs the original request, with the stats?
Hm, interesting question. The simplest answer is to look at the metrics & compare results for original vs hedged requests. Again as per #18 and custom http.RoundTripper
witch collects those stats.
The only thing is that it will report global stats, not per every request (that's how I imagine it's behaviour). Adding no-op ?req_id=XXX
to every request can help with request grouping and as a result true metric for each request.
I can try to make a PoC this week unless you're eager ;)
OK cool, thanks!
I'll be back on this topic next week, and I might put together a PR unless you get to it first 🙂
It doesn't necessarily need to be per-request; I just want to be able answer the question "of all the hedged requests we made, what % of them actually helped?".
I did a quick prototype #46 (so no tests) but looks like that's what we want.
If we got a response/result from waitResult
and it's successful (resp
is not nil
) than we can bump a metric for the original (index 0) or hedged (index non-zero).
I will try to cover this with a test tomorrow-ish. Review and thoughts are welcome.
CC: @storozhukBM