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Log and README optimization for LowNodeUtilization

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lixiang
2021-02-20 11:52:02 +08:00
parent 6d0360fd16
commit e014fda58e
2 changed files with 8 additions and 14 deletions
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4
README.md
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@@ -176,7 +176,9 @@ the node is considered over utilized. Any node between the thresholds, `threshol
considered appropriately utilized and is not considered for eviction. The threshold, `targetThresholds`,
can be configured for cpu, memory, and number of pods too in terms of percentage.
These thresholds, `thresholds` and `targetThresholds`, could be tuned as per your cluster requirements.
These thresholds, `thresholds` and `targetThresholds`, could be tuned as per your cluster requirements. Note that this
strategy evicts pods from `overutilized nodes` (those with usage above `targetThresholds`) to `underutilized nodes`
(those with usage below `thresholds`), it will abort if any number of `underutilized nodes` or `overutilized nodes` is zero.
**Parameters:**

18
pkg/descheduler/strategies/lownodeutilization.go
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@@ -115,32 +115,24 @@ func LowNodeUtilization(ctx context.Context, client clientset.Interface, strateg
klog.V(1).InfoS("Criteria for a node under utilization",
"CPU", thresholds[v1.ResourceCPU], "Mem", thresholds[v1.ResourceMemory], "Pods", thresholds[v1.ResourcePods])
klog.V(1).InfoS("Number of underutilized nodes", "totalNumber", len(lowNodes))
klog.V(1).InfoS("Criteria for a node above target utilization",
"CPU", targetThresholds[v1.ResourceCPU], "Mem", targetThresholds[v1.ResourceMemory], "Pods", targetThresholds[v1.ResourcePods])
klog.V(1).InfoS("Number of overutilized nodes", "totalNumber", len(targetNodes))
if len(lowNodes) == 0 {
klog.V(1).InfoS("No node is underutilized, nothing to do here, you might tune your thresholds further")
return
}
klog.V(1).InfoS("Total number of underutilized nodes", "totalNumber", len(lowNodes))
if len(lowNodes) < strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes {
klog.V(1).InfoS("Number of nodes underutilized is less than NumberOfNodes, nothing to do here", "underutilizedNodes", len(lowNodes), "numberOfNodes", strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes)
return
}
if len(lowNodes) == len(nodes) {
klog.V(1).InfoS("All nodes are underutilized, nothing to do here")
return
}
if len(targetNodes) == 0 {
klog.V(1).InfoS("All nodes are under target utilization, nothing to do here")
klog.V(1).InfoS("No node is overutilized, nothing to do here, you might tune your thresholds further")
return
}
klog.V(1).InfoS("Criteria for a node above target utilization",
"CPU", targetThresholds[v1.ResourceCPU], "Mem", targetThresholds[v1.ResourceMemory], "Pods", targetThresholds[v1.ResourcePods])
klog.V(1).InfoS("Number of nodes above target utilization", "totalNumber", len(targetNodes))
evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority))
evictPodsFromTargetNodes(