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shuffle_resource.go
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shuffle_resource.go
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package schedulers
import (
"errors"
"github.com/deepfabric/prophet/core"
"github.com/deepfabric/prophet/pb/metapb"
"github.com/deepfabric/prophet/schedule"
"github.com/deepfabric/prophet/schedule/filter"
"github.com/deepfabric/prophet/schedule/operator"
"github.com/deepfabric/prophet/schedule/opt"
"github.com/deepfabric/prophet/storage"
)
const (
// ShuffleResourceName is shuffle resource scheduler name.
ShuffleResourceName = "shuffle-resource-scheduler"
// ShuffleResourceType is shuffle resource scheduler type.
ShuffleResourceType = "shuffle-resource"
)
func init() {
schedule.RegisterSliceDecoderBuilder(ShuffleResourceType, func(args []string) schedule.ConfigDecoder {
return func(v interface{}) error {
conf, ok := v.(*shuffleResourceSchedulerConfig)
if !ok {
return errors.New("scheduler error configuration")
}
ranges, err := getKeyRanges(args)
if err != nil {
return err
}
conf.Ranges = ranges
conf.Roles = allRoles
return nil
}
})
schedule.RegisterScheduler(ShuffleResourceType, func(opController *schedule.OperatorController, storage storage.Storage, decoder schedule.ConfigDecoder) (schedule.Scheduler, error) {
conf := &shuffleResourceSchedulerConfig{storage: storage}
if err := decoder(conf); err != nil {
return nil, err
}
return newShuffleResourceScheduler(opController, conf), nil
})
}
type shuffleResourceScheduler struct {
*BaseScheduler
conf *shuffleResourceSchedulerConfig
filters []filter.Filter
}
// newShuffleResourceScheduler creates an admin scheduler that shuffles resources
// between containers.
func newShuffleResourceScheduler(opController *schedule.OperatorController, conf *shuffleResourceSchedulerConfig) schedule.Scheduler {
filters := []filter.Filter{
&filter.ContainerStateFilter{ActionScope: ShuffleResourceName, MoveResource: true},
filter.NewSpecialUseFilter(ShuffleResourceName),
}
base := NewBaseScheduler(opController)
return &shuffleResourceScheduler{
BaseScheduler: base,
conf: conf,
filters: filters,
}
}
func (s *shuffleResourceScheduler) GetName() string {
return ShuffleResourceName
}
func (s *shuffleResourceScheduler) GetType() string {
return ShuffleResourceType
}
func (s *shuffleResourceScheduler) EncodeConfig() ([]byte, error) {
return s.conf.EncodeConfig()
}
func (s *shuffleResourceScheduler) IsScheduleAllowed(cluster opt.Cluster) bool {
return s.OpController.OperatorCount(operator.OpResource) < cluster.GetOpts().GetResourceScheduleLimit()
}
func (s *shuffleResourceScheduler) Schedule(cluster opt.Cluster) []*operator.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
res, oldPeer := s.scheduleRemovePeer(cluster)
if res == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no-resource").Inc()
return nil
}
newPeer, ok := s.scheduleAddPeer(cluster, res, oldPeer)
if !ok {
schedulerCounter.WithLabelValues(s.GetName(), "no-new-peer").Inc()
return nil
}
op, err := operator.CreateMovePeerOperator(ShuffleResourceType, cluster, res, operator.OpAdmin, oldPeer.GetContainerID(), newPeer)
if err != nil {
schedulerCounter.WithLabelValues(s.GetName(), "create-operator-fail").Inc()
return nil
}
op.Counters = append(op.Counters, schedulerCounter.WithLabelValues(s.GetName(), "new-operator"))
op.SetPriorityLevel(core.HighPriority)
return []*operator.Operator{op}
}
func (s *shuffleResourceScheduler) scheduleRemovePeer(cluster opt.Cluster) (*core.CachedResource, metapb.Peer) {
candidates := filter.NewCandidates(cluster.GetContainers()).
FilterSource(cluster.GetOpts(), s.filters...).
Shuffle()
for _, source := range candidates.Containers {
var res *core.CachedResource
if s.conf.IsRoleAllow(roleFollower) {
res = cluster.RandFollowerResource(source.Meta.ID(), s.conf.GetRanges(), opt.HealthResource(cluster), opt.ReplicatedResource(cluster))
}
if res == nil && s.conf.IsRoleAllow(roleLeader) {
res = cluster.RandLeaderResource(source.Meta.ID(), s.conf.GetRanges(), opt.HealthResource(cluster), opt.ReplicatedResource(cluster))
}
if res == nil && s.conf.IsRoleAllow(roleLearner) {
res = cluster.RandLearnerResource(source.Meta.ID(), s.conf.GetRanges(), opt.HealthResource(cluster), opt.ReplicatedResource(cluster))
}
if res != nil {
if p, ok := res.GetContainerPeer(source.Meta.ID()); ok {
return res, p
}
return nil, metapb.Peer{}
}
schedulerCounter.WithLabelValues(s.GetName(), "no-resource").Inc()
}
schedulerCounter.WithLabelValues(s.GetName(), "no-source-container").Inc()
return nil, metapb.Peer{}
}
func (s *shuffleResourceScheduler) scheduleAddPeer(cluster opt.Cluster, res *core.CachedResource, oldPeer metapb.Peer) (metapb.Peer, bool) {
scoreGuard := filter.NewPlacementSafeguard(s.GetName(), cluster, res, cluster.GetContainer(oldPeer.ContainerID), s.OpController.GetCluster().GetResourceFactory())
excludedFilter := filter.NewExcludedFilter(s.GetName(), nil, res.GetContainerIDs())
target := filter.NewCandidates(cluster.GetContainers()).
FilterTarget(cluster.GetOpts(), s.filters...).
FilterTarget(cluster.GetOpts(), scoreGuard, excludedFilter).
RandomPick()
if target == nil {
return metapb.Peer{}, false
}
return metapb.Peer{ContainerID: target.Meta.ID(), Role: oldPeer.GetRole()}, true
}