mirror of
https://github.com/TECHNOFAB11/zfs-localpv.git
synced 2025-12-12 06:20:11 +01:00
136 lines
3.3 KiB
Go
136 lines
3.3 KiB
Go
/*
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Copyright © 2019 The OpenEBS 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 driver
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import (
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"math"
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"github.com/container-storage-interface/spec/lib/go/csi"
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"github.com/openebs/zfs-localpv/pkg/builder/volbuilder"
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k8sapi "github.com/openebs/zfs-localpv/pkg/client/k8s/v1alpha1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/klog"
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zfs "github.com/openebs/zfs-localpv/pkg/zfs"
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)
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// scheduling algorithm constants
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const (
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// pick the node where less volumes are provisioned for the given pool
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// this will be the default scheduler when none provided
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VolumeWeighted = "VolumeWeighted"
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)
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// GetNodeList gets the nodelist which satisfies the topology info
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func GetNodeList(topo *csi.TopologyRequirement) ([]string, error) {
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var nodelist []string
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list, err := k8sapi.ListNodes(metav1.ListOptions{})
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if err != nil {
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return nil, err
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}
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for _, node := range list.Items {
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for _, prf := range topo.Preferred {
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nodeFiltered := false
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for key, value := range prf.Segments {
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if node.Labels[key] != value {
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nodeFiltered = true
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break
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}
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}
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if nodeFiltered == false {
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nodelist = append(nodelist, node.Name)
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break
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}
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}
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}
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return nodelist, nil
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}
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// volumeWeightedScheduler goes through all the pools on the nodes mentioned
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// in the topology and picks the node which has less volume on
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// the given zfs pool.
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func volumeWeightedScheduler(nodelist []string, pool string) string {
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var selected string
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zvlist, err := volbuilder.NewKubeclient().
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WithNamespace(zfs.OpenEBSNamespace).
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List(metav1.ListOptions{})
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if err != nil {
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return ""
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}
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volmap := map[string]int{}
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// create the map of the volume count
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// for the given pool
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for _, zv := range zvlist.Items {
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if zv.Spec.PoolName == pool {
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volmap[zv.Spec.OwnerNodeID]++
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}
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}
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var numVol int = math.MaxInt32
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// schedule it on the node which has less
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// number of volume for the given pool
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for _, node := range nodelist {
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if volmap[node] < numVol {
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selected = node
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numVol = volmap[node]
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}
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}
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return selected
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}
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// scheduler schedules the PV as per topology constraints for
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// the given zfs pool.
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func scheduler(topo *csi.TopologyRequirement, schld string, pool string) string {
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if topo == nil ||
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len(topo.Preferred) == 0 {
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klog.Errorf("scheduler: topology information not provided")
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return ""
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}
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nodelist, err := GetNodeList(topo)
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if err != nil {
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klog.Errorf("scheduler: can not get the nodelist err : %v", err.Error())
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return ""
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} else if len(nodelist) == 0 {
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klog.Errorf("scheduler: nodelist is empty")
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return ""
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}
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// if there is a single node, schedule it on that
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if len(nodelist) == 1 {
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return nodelist[0]
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}
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switch schld {
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case VolumeWeighted:
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return volumeWeightedScheduler(nodelist, pool)
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default:
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return volumeWeightedScheduler(nodelist, pool)
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}
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return ""
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}
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