Code change:
/sig scheduling /priority important-soon See as an example. Part of /assign
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thx, I will do it soon.

Related discussion:
text: // The failure information is given by the error. type FitPredicate func(pod *v1.Pod, meta Metadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) <del> func isVolumeConflict(volume v1.Volume, pod *v1.Pod) bool { // fast path if there is no conflict checking targets. if volume.GCEPersistentDisk == nil && volume.AWSElasticBlockStore == nil && volume.RBD == nil && volume.ISCSI == nil { return false } for _, existingVolume := range pod.Spec.Volumes { // Same GCE disk mounted by multiple pods conflicts unless all pods mount it read-only. if volume.GCEPersistentDisk != nil && existingVolume.GCEPersistentDisk != nil { disk, existingDisk := volume.GCEPersistentDisk, existingVolume.GCEPersistentDisk if disk.PDName == existingDisk.PDName && !(disk.ReadOnly && existingDisk.ReadOnly) { return true } } if volume.AWSElasticBlockStore != nil && existingVolume.AWSElasticBlockStore != nil { if volume.AWSElasticBlockStore.VolumeID == existingVolume.AWSElasticBlockStore.VolumeID { return true } } if volume.ISCSI != nil && existingVolume.ISCSI != nil { iqn := volume.ISCSI.IQN eiqn := existingVolume.ISCSI.IQN // two ISCSI volumes are same, if they share the same iqn. As iscsi volumes are of type // RWO or ROX, we could permit only one RW mount. Same iscsi volume mounted by multiple Pods // conflict unless all other pods mount as read only. if iqn == eiqn && !(volume.ISCSI.ReadOnly && existingVolume.ISCSI.ReadOnly) { return true } } if volume.RBD != nil && existingVolume.RBD != nil { mon, pool, image := volume.RBD.CephMonitors, volume.RBD.RBDPool, volume.RBD.RBDImage emon, epool, eimage := existingVolume.RBD.CephMonitors, existingVolume.RBD.RBDPool, existingVolume.RBD.RBDImage // two RBDs images are the same if they share the same Ceph monitor, are in the same RADOS Pool, and have the same image name // only one read-write mount is permitted for the same RBD image. // same RBD image mounted by multiple Pods conflicts unless all Pods mount the image read-only if haveOverlap(mon, emon) && pool == epool && image == eimage && !(volume.RBD.ReadOnly && existingVolume.RBD.ReadOnly) { return true } } } return false } // NoDiskConflict evaluates if a pod can fit due to the volumes it requests, and those that // 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, ISCSI 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, and the image is read-only // - ISCSI forbids if any two pods share at least same IQN and ISCSI volume is read-only // TODO: migrate this into some per-volume specific code? func NoDiskConflict(pod *v1.Pod, meta Metadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) { for _, v := range pod.Spec.Volumes { for _, ev := range nodeInfo.Pods() { if isVolumeConflict(v, ev) { return false, []PredicateFailureReason{ErrDiskConflict}, nil } } } return true, nil, nil } </del> // MaxPDVolumeCountChecker contains information to check the max number of volumes for a predicate. type MaxPDVolumeCountChecker struct { filter         VolumeFilter