3c88de52c8
Marking the pods not ready on a node requires looping over them and updating each pod's status one at a time. This is performed serially, and can take a while if we're processing each node serially as well. Since the time is spent waiting on io, there's an opportunity to go faster by processing multiple nodes concurrently. This change modifies the loop to process nodes in parallel, using the same number of workers as doNodeProcessingPassWorker. This change also introduces histogram metrics to better observe monitorNodeHealth.
120 lines
3.8 KiB
Go
120 lines
3.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package nodelifecycle
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import (
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"sync"
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"k8s.io/component-base/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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)
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const (
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nodeControllerSubsystem = "node_collector"
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zoneHealthStatisticKey = "zone_health"
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zoneSizeKey = "zone_size"
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zoneNoUnhealthyNodesKey = "unhealthy_nodes_in_zone"
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evictionsNumberKey = "evictions_number"
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evictionsTotalKey = "evictions_total"
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updateNodeHealthKey = "update_node_health_duration_seconds"
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updateAllNodesHealthKey = "update_all_nodes_health_duration_seconds"
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)
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var (
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zoneHealth = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: nodeControllerSubsystem,
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Name: zoneHealthStatisticKey,
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Help: "Gauge measuring percentage of healthy nodes per zone.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"zone"},
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)
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zoneSize = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: nodeControllerSubsystem,
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Name: zoneSizeKey,
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Help: "Gauge measuring number of registered Nodes per zones.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"zone"},
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)
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unhealthyNodes = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: nodeControllerSubsystem,
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Name: zoneNoUnhealthyNodesKey,
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Help: "Gauge measuring number of not Ready Nodes per zones.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"zone"},
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)
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evictionsNumber = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: nodeControllerSubsystem,
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Name: evictionsNumberKey,
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Help: "Number of Node evictions that happened since current instance of NodeController started, This metric is replaced by node_collector_evictions_total.",
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DeprecatedVersion: "1.24.0",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"zone"},
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)
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evictionsTotal = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: nodeControllerSubsystem,
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Name: evictionsTotalKey,
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Help: "Number of Node evictions that happened since current instance of NodeController started.",
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StabilityLevel: metrics.STABLE,
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},
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[]string{"zone"},
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)
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updateNodeHealthDuration = metrics.NewHistogram(
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&metrics.HistogramOpts{
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Subsystem: nodeControllerSubsystem,
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Name: updateNodeHealthKey,
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Help: "Duration in seconds for NodeController to update the health of a single node.",
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Buckets: metrics.ExponentialBuckets(0.001, 4, 8), // 1ms -> ~15s
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StabilityLevel: metrics.ALPHA,
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},
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)
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updateAllNodesHealthDuration = metrics.NewHistogram(
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&metrics.HistogramOpts{
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Subsystem: nodeControllerSubsystem,
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Name: updateAllNodesHealthKey,
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Help: "Duration in seconds for NodeController to update the health of all nodes.",
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Buckets: metrics.ExponentialBuckets(0.01, 4, 8), // 10ms -> ~3m
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StabilityLevel: metrics.ALPHA,
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},
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)
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)
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var registerMetrics sync.Once
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// Register the metrics that are to be monitored.
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func Register() {
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registerMetrics.Do(func() {
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legacyregistry.MustRegister(zoneHealth)
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legacyregistry.MustRegister(zoneSize)
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legacyregistry.MustRegister(unhealthyNodes)
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legacyregistry.MustRegister(evictionsNumber)
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legacyregistry.MustRegister(evictionsTotal)
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legacyregistry.MustRegister(updateNodeHealthDuration)
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legacyregistry.MustRegister(updateAllNodesHealthDuration)
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})
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}
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