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BUG 1858400: [Performance] Lease refresh period for machine-api-controllers is too high, causes heavy writes to etcd at idle #114

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Aug 25, 2020
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BUG 1858400: [Performance] Lease refresh period for machine-api-controllers is too high, causes heavy writes to etcd at idle #114

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12 changes: 11 additions & 1 deletion cmd/manager/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,13 @@ import (
"sigs.k8s.io/controller-runtime/pkg/runtime/signals"
)

// The default durations for the leader election operations.
var (
leaseDuration = 120 * time.Second
renewDeadline = 110 * time.Second
retryPeriod = 20 * time.Second
)

func main() {

flag.Set("logtostderr", "true")
Expand Down Expand Up @@ -62,7 +69,7 @@ func main() {

leaderElectLeaseDuration := flag.Duration(
"leader-elect-lease-duration",
90*time.Second,
leaseDuration,
"The duration that non-leader candidates will wait after observing a leadership renewal until attempting to acquire leadership of a led but unrenewed leader slot. This is effectively the maximum duration that a leader can be stopped before it is replaced by another candidate. This is only applicable if leader election is enabled.",
)
metricsAddress := flag.String(
Expand All @@ -88,6 +95,9 @@ func main() {
LeaderElectionID: "cluster-api-provider-openstack-leader",
LeaseDuration: leaderElectLeaseDuration,
MetricsBindAddress: *metricsAddress,
// Slow the default retry and renew election rate to reduce etcd writes at idle: BZ 1858400
RetryPeriod: &retryPeriod,
RenewDeadline: &renewDeadline,
}
if *watchNamespace != "" {
opts.Namespace = *watchNamespace
Expand Down