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9eaf824398
* add jaeger support, link hot container & req span * adds jaeger support now with FN_JAEGER_URL, there's a simple tutorial in the operating/metrics.md file now and it's pretty easy to get up and running. * links a hot request span to a hot container span. when we change this to sample at a lower ratio we'll need to finagle the hot container span to always sample or something, otherwise we'll hide that info. at least, since we're sampling at 100% for now if this is flipped on, can see freeze/unfreeze etc. if they hit. this is useful for debugging. note that zipkin's exporter does not follow the link at all, hence jaeger... and they're backed by the Cloud Empire now (CNCF) so we'll probably use it anyway. * vendor: add thrift for jaeger
47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gensupport
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import (
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"math/rand"
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"time"
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)
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type BackoffStrategy interface {
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// Pause returns the duration of the next pause and true if the operation should be
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// retried, or false if no further retries should be attempted.
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Pause() (time.Duration, bool)
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// Reset restores the strategy to its initial state.
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Reset()
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}
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// ExponentialBackoff performs exponential backoff as per https://en.wikipedia.org/wiki/Exponential_backoff.
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// The initial pause time is given by Base.
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// Once the total pause time exceeds Max, Pause will indicate no further retries.
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type ExponentialBackoff struct {
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Base time.Duration
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Max time.Duration
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total time.Duration
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n uint
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}
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func (eb *ExponentialBackoff) Pause() (time.Duration, bool) {
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if eb.total > eb.Max {
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return 0, false
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}
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// The next pause is selected from randomly from [0, 2^n * Base).
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d := time.Duration(rand.Int63n((1 << eb.n) * int64(eb.Base)))
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eb.total += d
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eb.n++
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return d, true
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}
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func (eb *ExponentialBackoff) Reset() {
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eb.n = 0
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eb.total = 0
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}
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