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Merge pull request #15956 from rootfs/no-disk-conflict

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k8s-merge-robot
2015-11-12 01:27:39 -08:00
parent d3f5ab5ba2 bcbdd44267
commit 986dd3ea49
2 changed files with 102 additions and 15 deletions
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62
plugin/pkg/scheduler/algorithm/predicates/predicates.go
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@@ -56,11 +56,11 @@ func isVolumeConflict(volume api.Volume, pod *api.Pod) bool {
if volume.GCEPersistentDisk != nil {
disk := volume.GCEPersistentDisk
manifest := &(pod.Spec)
for ix := range manifest.Volumes {
if manifest.Volumes[ix].GCEPersistentDisk != nil &&
manifest.Volumes[ix].GCEPersistentDisk.PDName == disk.PDName &&
!(manifest.Volumes[ix].GCEPersistentDisk.ReadOnly && disk.ReadOnly) {
existingPod := &(pod.Spec)
for ix := range existingPod.Volumes {
if existingPod.Volumes[ix].GCEPersistentDisk != nil &&
existingPod.Volumes[ix].GCEPersistentDisk.PDName == disk.PDName &&
!(existingPod.Volumes[ix].GCEPersistentDisk.ReadOnly && disk.ReadOnly) {
return true
}
}
@@ -68,27 +68,47 @@ func isVolumeConflict(volume api.Volume, pod *api.Pod) bool {
if volume.AWSElasticBlockStore != nil {
volumeID := volume.AWSElasticBlockStore.VolumeID
manifest := &(pod.Spec)
for ix := range manifest.Volumes {
if manifest.Volumes[ix].AWSElasticBlockStore != nil &&
manifest.Volumes[ix].AWSElasticBlockStore.VolumeID == volumeID {
existingPod := &(pod.Spec)
for ix := range existingPod.Volumes {
if existingPod.Volumes[ix].AWSElasticBlockStore != nil &&
existingPod.Volumes[ix].AWSElasticBlockStore.VolumeID == volumeID {
return true
}
}
}
if volume.RBD != nil {
mon := volume.RBD.CephMonitors
pool := volume.RBD.RBDPool
image := volume.RBD.RBDImage
existingPod := &(pod.Spec)
for ix := range existingPod.Volumes {
if existingPod.Volumes[ix].RBD != nil {
mon_m := existingPod.Volumes[ix].RBD.CephMonitors
pool_m := existingPod.Volumes[ix].RBD.RBDPool
image_m := existingPod.Volumes[ix].RBD.RBDImage
if haveSame(mon, mon_m) && pool_m == pool && image_m == image {
return true
}
}
}
}
return false
}
// NoDiskConflict evaluates if a pod can fit due to the volumes it requests, and those that
// are already mounted. Some times of volumes are mounted onto node machines. For now, these mounts
// are exclusive so if there is already a volume mounted on that node, another pod can't schedule
// there. This is GCE and Amazon EBS specific for now.
// are already mounted. If there is already a volume mounted on that node, another pod that uses the same volume
// can't be scheduled there.
// This is GCE, Amazon EBS, and Ceph RBD specific for now:
// - GCE PD allows multiple mounts as long as they're all read-only
// - AWS EBS forbids any two pods mounting the same volume ID
// - Ceph RBD forbids if any two pods share at least same monitor, and match pool and image.
// TODO: migrate this into some per-volume specific code?
func NoDiskConflict(pod *api.Pod, existingPods []*api.Pod, node string) (bool, error) {
manifest := &(pod.Spec)
for ix := range manifest.Volumes {
podSpec := &(pod.Spec)
for ix := range podSpec.Volumes {
for podIx := range existingPods {
if isVolumeConflict(manifest.Volumes[ix], existingPods[podIx]) {
if isVolumeConflict(podSpec.Volumes[ix], existingPods[podIx]) {
return false, nil
}
}
@@ -416,3 +436,15 @@ func MapPodsToMachines(lister algorithm.PodLister) (map[string][]*api.Pod, error
}
return machineToPods, nil
}
// search two arrays and return true if they have at least one common element; return false otherwise
func haveSame(a1, a2 []string) bool {
for _, val1 := range a1 {
for _, val2 := range a2 {
if val1 == val2 {
return true
}
}
}
return false
}