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67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
package querycoord
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import "sort"
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type balancer interface {
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addNode(nodeID int64) ([]*balancePlan, error)
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removeNode(nodeID int64) []*balancePlan
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rebalance() []*balancePlan
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}
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type balancePlan struct {
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nodeID int64
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sourceReplica int64
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targetReplica int64
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}
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type replicaBalancer struct {
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meta Meta
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cluster Cluster
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}
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func newReplicaBalancer(meta Meta, cluster Cluster) *replicaBalancer {
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return &replicaBalancer{meta, cluster}
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}
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func (b *replicaBalancer) addNode(nodeID int64) ([]*balancePlan, error) {
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// allocate this node to all collections replicas
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var ret []*balancePlan
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collections := b.meta.showCollections()
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for _, c := range collections {
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replicas, err := b.meta.getReplicasByCollectionID(c.GetCollectionID())
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if err != nil {
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return nil, err
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}
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if len(replicas) == 0 {
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continue
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}
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replicaAvailableMemory := make(map[UniqueID]uint64, len(replicas))
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for _, replica := range replicas {
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replicaAvailableMemory[replica.ReplicaID] = getReplicaAvailableMemory(b.cluster, replica)
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}
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sort.Slice(replicas, func(i, j int) bool {
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replicai := replicas[i].ReplicaID
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replicaj := replicas[j].ReplicaID
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return replicaAvailableMemory[replicai] < replicaAvailableMemory[replicaj]
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})
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ret = append(ret, &balancePlan{
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nodeID: nodeID,
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sourceReplica: invalidReplicaID,
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targetReplica: replicas[0].GetReplicaID(),
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})
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}
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return ret, nil
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}
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func (b *replicaBalancer) removeNode(nodeID int64) []*balancePlan {
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// for this version, querynode does not support move from a replica to another
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return nil
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}
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func (b *replicaBalancer) rebalance() []*balancePlan {
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return nil
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}
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