Augment the router penalty and decay as a hack fix (#912)
* Augment the router penalty and decay as a hack fix * increase recovery cost
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@ -23,15 +23,13 @@ const (
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// AdvertSuppress is advert suppression threshold
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AdvertSuppress = 2000.0
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// AdvertRecover is advert recovery threshold
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AdvertRecover = 750.0
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AdvertRecover = 1000.0
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// DefaultAdvertTTL is default advertisement TTL
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DefaultAdvertTTL = 1 * time.Minute
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// DeletePenalty penalises route deletion
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DeletePenalty = 1000.0
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// UpdatePenalty penalises route updates
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UpdatePenalty = 500.0
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// Penalty for routes processed multiple times
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Penalty = 2000.0
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// PenaltyHalfLife is the time the advert penalty decays to half its value
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PenaltyHalfLife = 2.0
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PenaltyHalfLife = 2.5
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// MaxSuppressTime defines time after which the suppressed advert is deleted
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MaxSuppressTime = 5 * time.Minute
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)
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@ -385,15 +383,16 @@ func (r *router) advertiseEvents() error {
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// decay the event penalty
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delta := time.Since(advert.lastUpdate).Seconds()
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advert.penalty = advert.penalty * math.Exp(-delta*PenaltyDecay)
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service := advert.event.Route.Service
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address := advert.event.Route.Address
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// suppress/recover the event based on its penalty level
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switch {
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case advert.penalty > AdvertSuppress && !advert.isSuppressed:
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log.Debugf("Router supressing advert %d for route %s", key, advert.event.Route.Address)
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log.Debugf("Router suppressing advert %d %.2f for route %s %s", key, advert.penalty, service, address)
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advert.isSuppressed = true
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advert.suppressTime = time.Now()
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case advert.penalty < AdvertRecover && advert.isSuppressed:
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log.Debugf("Router recovering advert %d for route %s", key, advert.event.Route.Address)
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log.Debugf("Router recovering advert %d %.2f for route %s %s", key, advert.penalty, service, address)
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advert.isSuppressed = false
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}
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@ -425,15 +424,11 @@ func (r *router) advertiseEvents() error {
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if e == nil {
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continue
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}
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log.Debugf("Router processing table event %s for service %s", e.Type, e.Route.Address)
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log.Debugf("Router processing table event %s for service %s %s", e.Type, e.Route.Service, e.Route.Address)
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// determine the event penalty
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var penalty float64
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switch e.Type {
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case Update:
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penalty = UpdatePenalty
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case Delete:
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penalty = DeletePenalty
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}
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// TODO: should there be any difference in penalty for different event types
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penalty := Penalty
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// check if we have already registered the route
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hash := e.Route.Hash()
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@ -456,7 +451,7 @@ func (r *router) advertiseEvents() error {
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// update event penalty and timestamp
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advert.lastUpdate = time.Now()
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advert.penalty += penalty
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log.Debugf("Router advert %d for route %s event penalty: %f", hash, advert.event.Route.Address, advert.penalty)
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log.Debugf("Router advert %d for route %s %s event penalty: %f", hash, advert.event.Route.Service, advert.event.Route.Address, advert.penalty)
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case <-r.exit:
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// first wait for the advertiser to finish
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r.advertWg.Wait()
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@ -665,7 +660,7 @@ func (r *router) Process(a *Advert) error {
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// create a copy of the route
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route := event.Route
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action := event.Type
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log.Debugf("Router %s applying %s from router %s for address: %s", r.options.Id, action, route.Router, route.Address)
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log.Debugf("Router %s applying %s from router %s for service %s %s", r.options.Id, action, route.Router, route.Service, route.Address)
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if err := r.manageRoute(route, fmt.Sprintf("%s", action)); err != nil {
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return fmt.Errorf("failed applying action %s to routing table: %s", action, err)
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}
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