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Merge pull request #27754 from shannonxtreme/preemption-qos

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Clarify use of QoS in eviction ranking
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Kubernetes Prow Robot
2021-04-28 12:50:50 -07:00
committed by GitHub
parent 1abb1e0a10 979ffdf355
commit 932d25ee87
1 changed files with 9 additions and 8 deletions
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content/en/docs/concepts/configuration/pod-priority-preemption.md
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@@ -353,13 +353,15 @@ the removal of the lowest priority Pods is not sufficient to allow the scheduler
to schedule the preemptor Pod, or if the lowest priority Pods are protected by to schedule the preemptor Pod, or if the lowest priority Pods are protected by
`PodDisruptionBudget`. `PodDisruptionBudget`.
The only component that considers both QoS and Pod priority is The kubelet uses Priority to determine pod order for [out-of-resource eviction](/docs/tasks/administer-cluster/out-of-resource/).
[kubelet out-of-resource eviction](/docs/tasks/administer-cluster/out-of-resource/). You can use the QoS class to estimate the order in which pods are most likely
The kubelet ranks Pods for eviction first by whether or not their usage of the to get evicted. The kubelet ranks pods for eviction based on the following factors:
starved resource exceeds requests, then by Priority, and then by the consumption
of the starved compute resource relative to the Pods' scheduling requests. 1. Whether the starved resource usage exceeds requests
See 1. Pod Priority
[evicting end-user pods](/docs/tasks/administer-cluster/out-of-resource/#evicting-end-user-pods) 1. Amount of resource usage relative to requests
See [evicting end-user pods](/docs/tasks/administer-cluster/out-of-resource/#evicting-end-user-pods)
for more details. for more details.
kubelet out-of-resource eviction does not evict Pods when their kubelet out-of-resource eviction does not evict Pods when their
@@ -367,7 +369,6 @@ usage does not exceed their requests. If a Pod with lower priority is not
exceeding its requests, it won't be evicted. Another Pod with higher priority exceeding its requests, it won't be evicted. Another Pod with higher priority
that exceeds its requests may be evicted. that exceeds its requests may be evicted.
## {{% heading "whatsnext" %}} ## {{% heading "whatsnext" %}}
* Read about using ResourceQuotas in connection with PriorityClasses: [limit Priority Class consumption by default](/docs/concepts/policy/resource-quotas/#limit-priority-class-consumption-by-default) * Read about using ResourceQuotas in connection with PriorityClasses: [limit Priority Class consumption by default](/docs/concepts/policy/resource-quotas/#limit-priority-class-consumption-by-default)