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本文主要研究一下cortex的Backoff

Backoff

github.com/cortexproject/cortex/pkg/util/backoff.go

// Backoff implements exponential backoff with randomized wait times
type Backoff struct {
	cfg          BackoffConfig
	ctx          context.Context
	numRetries   int
	nextDelayMin time.Duration
	nextDelayMax time.Duration
}

// NewBackoff creates a Backoff object. Pass a Context that can also terminate the operation.
func NewBackoff(ctx context.Context, cfg BackoffConfig) *Backoff {
	return &Backoff{
		cfg:          cfg,
		ctx:          ctx,
		nextDelayMin: cfg.MinBackoff,
		nextDelayMax: doubleDuration(cfg.MinBackoff, cfg.MaxBackoff),
	}
}
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