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Patch PVC when storage request is increased
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,203 @@ | ||
| // Copyright 2020 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 member | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1" | ||
| "github.com/pingcap/tidb-operator/pkg/label" | ||
| "github.com/pingcap/tidb-operator/pkg/util" | ||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/api/resource" | ||
| "k8s.io/apimachinery/pkg/labels" | ||
| "k8s.io/apimachinery/pkg/selection" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| coreinformers "k8s.io/client-go/informers/core/v1" | ||
| storageinformers "k8s.io/client-go/informers/storage/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| corelisters "k8s.io/client-go/listers/core/v1" | ||
| storagelisters "k8s.io/client-go/listers/storage/v1" | ||
| "k8s.io/klog" | ||
| ) | ||
|
|
||
| // PVCResizerInterface represents the interface of PVC Resizer. | ||
| // It patches the PVCs owned by tidb cluster according to the latest | ||
| // storage request specified by the user. See | ||
| // https://github.com/pingcap/tidb-operator/issues/3004 for more details. | ||
| // | ||
| // Implementation: | ||
| // | ||
| // for every unmatched PVC (desiredCapacity != actualCapacity) | ||
| // if storageClass does not support VolumeExpansion, skip and continue | ||
| // if not patched, patch | ||
| // | ||
| // We patch all PVCs at the same time. For many cloud storage plugins (e.g. | ||
| // AWS-EBS, GCE-PD), they support online file system expansion in latest | ||
| // Kubernetes (1.15+). | ||
| // | ||
| // Limitations: | ||
| // | ||
| // - Note that the current statfulset implementation does not allow | ||
| // `volumeClaimTemplates` to be changed, so new PVCs created by statefulset | ||
| // controller will use the old storage request. | ||
| // - This is best effort, before statefulset volume resize feature (e.g. | ||
| // https://github.com/kubernetes/enhancements/pull/1848) to be implemented. | ||
| // - If the feature `ExpandInUsePersistentVolumes` is not enabled or the volume | ||
| // plugin does not support, the pod referencing the volume must be deleted and | ||
| // recreted after the `FileSystemResizePending` condition becomes true. | ||
| // | ||
| type PVCResizerInterface interface { | ||
| Resize(*v1alpha1.TidbCluster) error | ||
| } | ||
|
|
||
| var ( | ||
| pdRequirement = util.MustNewRequirement(label.ComponentLabelKey, selection.Equals, []string{label.PDLabelVal}) | ||
| tikvRequirement = util.MustNewRequirement(label.ComponentLabelKey, selection.Equals, []string{label.TiKVLabelVal}) | ||
| tiflashRequirement = util.MustNewRequirement(label.ComponentLabelKey, selection.Equals, []string{label.TiFlashLabelVal}) | ||
| pumpRequirement = util.MustNewRequirement(label.ComponentLabelKey, selection.Equals, []string{label.PumpLabelVal}) | ||
| ) | ||
|
|
||
| type pvcResizer struct { | ||
| kubeCli kubernetes.Interface | ||
| pvcLister corelisters.PersistentVolumeClaimLister | ||
| scLister storagelisters.StorageClassLister | ||
| } | ||
|
|
||
| func (p *pvcResizer) Resize(tc *v1alpha1.TidbCluster) error { | ||
| selector, err := label.New().Instance(tc.GetInstanceName()).Selector() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| // patch PD PVCs | ||
| if tc.Spec.PD != nil { | ||
| if storageRequest, ok := tc.Spec.PD.Requests[corev1.ResourceStorage]; ok { | ||
| err = p.patchPVCs(tc.GetNamespace(), selector.Add(*pdRequirement), storageRequest, "") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| // patch TiKV PVCs | ||
| if tc.Spec.TiKV != nil { | ||
| if storageRequest, ok := tc.Spec.TiKV.Requests[corev1.ResourceStorage]; ok { | ||
| err = p.patchPVCs(tc.GetNamespace(), selector.Add(*tikvRequirement), storageRequest, "") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| // patch TiFlash PVCs | ||
| if tc.Spec.TiFlash != nil { | ||
| for i, claim := range tc.Spec.TiFlash.StorageClaims { | ||
| if storageRequest, ok := claim.Resources.Requests[corev1.ResourceStorage]; ok { | ||
| prefix := fmt.Sprintf("data%d", i) | ||
| err = p.patchPVCs(tc.GetNamespace(), selector.Add(*tiflashRequirement), storageRequest, prefix) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| } | ||
| // patch Pump PVCs | ||
| if tc.Spec.Pump != nil { | ||
| if storageRequest, ok := tc.Spec.Pump.Requests[corev1.ResourceStorage]; ok { | ||
| err = p.patchPVCs(tc.GetNamespace(), selector.Add(*pumpRequirement), storageRequest, "") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (p *pvcResizer) isVolumeExpansionSupported(storageClassName string) (bool, error) { | ||
| sc, err := p.scLister.Get(storageClassName) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| if sc.AllowVolumeExpansion == nil { | ||
| return false, nil | ||
| } | ||
| return *sc.AllowVolumeExpansion, nil | ||
| } | ||
|
|
||
| // patchPVCs patches PVCs filtered by selector and prefix. | ||
| func (p *pvcResizer) patchPVCs(ns string, selector labels.Selector, storageRequest resource.Quantity, prefix string) error { | ||
| pvcs, err := p.pvcLister.PersistentVolumeClaims(ns).List(selector) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| mergePatch, err := json.Marshal(map[string]interface{}{ | ||
| "spec": map[string]interface{}{ | ||
| "resources": corev1.ResourceRequirements{ | ||
| Requests: corev1.ResourceList{ | ||
| corev1.ResourceStorage: storageRequest, | ||
| }, | ||
| }, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, pvc := range pvcs { | ||
| if !strings.HasPrefix(pvc.Name, prefix) { | ||
| continue | ||
| } | ||
| if pvc.Spec.StorageClassName == nil { | ||
| klog.Warningf("PVC %s/%s has no storage class, skipped", pvc.Namespace, pvc.Name) | ||
| continue | ||
| } | ||
| volumeExpansionSupported, err := p.isVolumeExpansionSupported(*pvc.Spec.StorageClassName) | ||
| fmt.Printf("volumeExpansionSupported: %v, err: %v\n", volumeExpansionSupported, err) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if !volumeExpansionSupported { | ||
| klog.Warningf("Storage Class %q used by PVC %s/%s does not support volume expansion, skipped", *pvc.Spec.StorageClassName, pvc.Namespace, pvc.Name) | ||
| continue | ||
| } | ||
| if currentRequest, ok := pvc.Spec.Resources.Requests[corev1.ResourceStorage]; !ok || currentRequest != storageRequest { | ||
| _, err = p.kubeCli.CoreV1().PersistentVolumeClaims(pvc.Namespace).Patch(pvc.Name, types.MergePatchType, mergePatch) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| klog.V(2).Infof("PVC %s/%s storage request is updated from %s to %s", pvc.Namespace, pvc.Name, currentRequest.String(), storageRequest.String()) | ||
| } else { | ||
| klog.V(4).Infof("PVC %s/%s storage request is already %s, skipped", pvc.Namespace, pvc.Name, storageRequest.String()) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func NewPVCResizer(kubeCli kubernetes.Interface, pvcInformer coreinformers.PersistentVolumeClaimInformer, storageClassInformer storageinformers.StorageClassInformer) PVCResizerInterface { | ||
| return &pvcResizer{ | ||
| kubeCli: kubeCli, | ||
| pvcLister: pvcInformer.Lister(), | ||
| scLister: storageClassInformer.Lister(), | ||
| } | ||
| } | ||
|
|
||
| type fakePVCResizer struct { | ||
| } | ||
|
|
||
| func (f *fakePVCResizer) Resize(_ *v1alpha1.TidbCluster) error { | ||
| return nil | ||
| } | ||
|
|
||
| func NewFakePVCResizer() PVCResizerInterface { | ||
| return &fakePVCResizer{} | ||
| } |
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