forked from pingcap/tidb-operator
/
util.go
224 lines (209 loc) · 7.3 KB
/
util.go
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// Copyright 2018 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"fmt"
"sort"
"strconv"
"strings"
"github.com/golang/glog"
"github.com/pingcap/tidb-operator/pkg/apis/pingcap.com/v1alpha1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/kubernetes/pkg/kubelet/apis"
)
var (
// weight is in range 1-100
topologySchedulingWeight = map[string]int32{
"region": 10,
"zone": 20,
"rack": 40,
apis.LabelHostname: 80,
}
)
const (
// StoreUpState is state when tikv store is normal
StoreUpState = "Up"
// StoreOfflineState is state when tikv store is offline
StoreOfflineState = "Offline"
// StoreDownState is state when tikv store is down
StoreDownState = "Down"
// StoreTombstoneState is state when tikv store is tombstone
StoreTombstoneState = "Tombstone"
)
// AntiAffinityForPod creates a PodAntiAffinity with antiLabels
func AntiAffinityForPod(namespace string, antiLabels map[string]string) *corev1.PodAntiAffinity {
keys := []string{}
for key := range topologySchedulingWeight {
keys = append(keys, key)
}
sort.Strings(keys) // we must use sorted selector, otherwise affinity may vary causing new statefulset generated and pod recreated
terms := []corev1.WeightedPodAffinityTerm{}
for _, key := range keys {
term := corev1.WeightedPodAffinityTerm{
Weight: topologySchedulingWeight[key],
PodAffinityTerm: corev1.PodAffinityTerm{
LabelSelector: &metav1.LabelSelector{MatchLabels: antiLabels},
TopologyKey: key,
Namespaces: []string{namespace},
},
}
terms = append(terms, term)
}
return &corev1.PodAntiAffinity{
PreferredDuringSchedulingIgnoredDuringExecution: terms,
}
}
// AffinityForNodeSelector creates an Affinity for NodeSelector
// Externally we use NodeSelector for simplicity,
// while internally we convert it to affinity which can express complex scheduling rules
func AffinityForNodeSelector(namespace string, required bool, antiLabels, selector map[string]string) *corev1.Affinity {
if selector == nil {
return nil
}
affinity := &corev1.Affinity{}
if antiLabels != nil {
affinity.PodAntiAffinity = AntiAffinityForPod(namespace, antiLabels)
}
keys := []string{}
for key := range selector {
keys = append(keys, key)
}
sort.Strings(keys) // we must use sorted selector, otherwise affinity may vary causing new statefulset generated and pod recreated
requiredTerms := []corev1.NodeSelectorTerm{}
if required { // all nodeSelectors are required
var exps []corev1.NodeSelectorRequirement
for _, key := range keys {
requirement := corev1.NodeSelectorRequirement{
Key: key,
Operator: corev1.NodeSelectorOpIn,
Values: strings.Split(selector[key], ","),
}
// NodeSelectorRequirement in the same MatchExpressions are ANDed otherwise ORed
exps = append(exps, requirement)
}
requiredTerms = append(requiredTerms, corev1.NodeSelectorTerm{MatchExpressions: exps})
affinity.NodeAffinity = &corev1.NodeAffinity{
RequiredDuringSchedulingIgnoredDuringExecution: &corev1.NodeSelector{
NodeSelectorTerms: requiredTerms,
},
}
return affinity
}
preferredTerms := []corev1.PreferredSchedulingTerm{}
exps := []corev1.NodeSelectorRequirement{}
for _, key := range keys {
// region,zone,rack,host are preferred labels, others are must match labels
if weight, ok := topologySchedulingWeight[key]; ok {
if selector[key] == "" {
continue
}
values := strings.Split(selector[key], ",")
t := corev1.PreferredSchedulingTerm{
Weight: weight,
Preference: corev1.NodeSelectorTerm{
MatchExpressions: []corev1.NodeSelectorRequirement{
{
Key: key,
Operator: corev1.NodeSelectorOpIn,
Values: values,
},
},
},
}
preferredTerms = append(preferredTerms, t)
} else {
requirement := corev1.NodeSelectorRequirement{
Key: key,
Operator: corev1.NodeSelectorOpIn,
Values: []string{selector[key]},
}
// NodeSelectorRequirement in the same MatchExpressions are ANDed otherwise ORed
exps = append(exps, requirement)
}
}
requiredTerms = append(requiredTerms, corev1.NodeSelectorTerm{MatchExpressions: exps})
affinity.NodeAffinity = &corev1.NodeAffinity{
RequiredDuringSchedulingIgnoredDuringExecution: &corev1.NodeSelector{
NodeSelectorTerms: requiredTerms,
},
PreferredDuringSchedulingIgnoredDuringExecution: preferredTerms,
}
return affinity
}
// ResourceRequirement creates ResourceRequirements for MemberSpec
// Optionally pass in a default value
func ResourceRequirement(spec v1alpha1.ContainerSpec, defaultRequests ...corev1.ResourceRequirements) corev1.ResourceRequirements {
rr := corev1.ResourceRequirements{}
if len(defaultRequests) > 0 {
defaultRequest := defaultRequests[0]
rr.Requests = make(map[corev1.ResourceName]resource.Quantity)
rr.Requests[corev1.ResourceCPU] = defaultRequest.Requests[corev1.ResourceCPU]
rr.Requests[corev1.ResourceMemory] = defaultRequest.Requests[corev1.ResourceMemory]
rr.Limits = make(map[corev1.ResourceName]resource.Quantity)
rr.Limits[corev1.ResourceCPU] = defaultRequest.Limits[corev1.ResourceCPU]
rr.Limits[corev1.ResourceMemory] = defaultRequest.Limits[corev1.ResourceMemory]
}
if spec.Requests != nil {
if rr.Requests == nil {
rr.Requests = make(map[corev1.ResourceName]resource.Quantity)
}
if spec.Requests.CPU != "" {
if q, err := resource.ParseQuantity(spec.Requests.CPU); err != nil {
glog.Errorf("failed to parse CPU resource %s to quantity: %v", spec.Requests.CPU, err)
} else {
rr.Requests[corev1.ResourceCPU] = q
}
}
if spec.Requests.Memory != "" {
if q, err := resource.ParseQuantity(spec.Requests.Memory); err != nil {
glog.Errorf("failed to parse memory resource %s to quantity: %v", spec.Requests.Memory, err)
} else {
rr.Requests[corev1.ResourceMemory] = q
}
}
}
if spec.Limits != nil {
if rr.Limits == nil {
rr.Limits = make(map[corev1.ResourceName]resource.Quantity)
}
if spec.Limits.CPU != "" {
if q, err := resource.ParseQuantity(spec.Limits.CPU); err != nil {
glog.Errorf("failed to parse CPU resource %s to quantity: %v", spec.Limits.CPU, err)
} else {
rr.Limits[corev1.ResourceCPU] = q
}
}
if spec.Limits.Memory != "" {
if q, err := resource.ParseQuantity(spec.Limits.Memory); err != nil {
glog.Errorf("failed to parse memory resource %s to quantity: %v", spec.Limits.Memory, err)
} else {
rr.Limits[corev1.ResourceMemory] = q
}
}
}
return rr
}
func GetOrdinalFromPodName(podName string) (int32, error) {
ordinalStr := podName[strings.LastIndex(podName, "-")+1:]
ordinalInt, err := strconv.Atoi(ordinalStr)
if err != nil {
return int32(0), err
}
return int32(ordinalInt), nil
}
func GetNextOrdinalPodName(podName string, ordinal int32) string {
basicStr := podName[:strings.LastIndex(podName, "-")]
return fmt.Sprintf("%s-%d", basicStr, ordinal+1)
}