Monis Khan c71ffdcd1e leader election: use better duration defaults ... OpenShift has good defaults for these duration fields that we can use instead of coming up with them ourselves: e14e06ba8d/pkg/config/leaderelection/leaderelection.go (L87-L109) Copied here for easy future reference: // We want to be able to tolerate 60s of kube-apiserver disruption without causing pod restarts. // We want the graceful lease re-acquisition fairly quick to avoid waits on new deployments and other rollouts. // We want a single set of guidance for nearly every lease in openshift. If you're special, we'll let you know. // 1. clock skew tolerance is leaseDuration-renewDeadline == 30s // 2. kube-apiserver downtime tolerance is == 78s // lastRetry=floor(renewDeadline/retryPeriod)*retryPeriod == 104 // downtimeTolerance = lastRetry-retryPeriod == 78s // 3. worst non-graceful lease acquisition is leaseDuration+retryPeriod == 163s // 4. worst graceful lease acquisition is retryPeriod == 26s if ret.LeaseDuration.Duration == 0 { ret.LeaseDuration.Duration = 137 * time.Second } if ret.RenewDeadline.Duration == 0 { // this gives 107/26=4 retries and allows for 137-107=30 seconds of clock skew // if the kube-apiserver is unavailable for 60s starting just before t=26 (the first renew), // then we will retry on 26s intervals until t=104 (kube-apiserver came back up at 86), and there will // be 33 seconds of extra time before the lease is lost. ret.RenewDeadline.Duration = 107 * time.Second } if ret.RetryPeriod.Duration == 0 { ret.RetryPeriod.Duration = 26 * time.Second } Signed-off-by: Monis Khan <mok@vmware.com>		2021-08-24 16:21:53 -04:00
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leaderelection.go	leader election: use better duration defaults	2021-08-24 16:21:53 -04:00
leaderelection_test.go	leader election: in-memory leader status is stopped before release	2021-08-24 15:02:56 -04:00