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Share common parameters for EC re-balancing functions under a single struct. (#6319) 

TODO cleanup for https://github.com/seaweedfs/seaweedfs/discussions/6179.
pull/6320/head
Lisandro Pin 2 weeks ago
committed by GitHub
parent
edef485333
commit
34cdbdd279
No known key found for this signature in database GPG Key ID: B5690EEEBB952194
3 changed files with 189 additions and 187 deletions
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  1. 118
      weed/shell/command_ec_common.go
  2. 97
      weed/shell/command_ec_common_test.go
  3. 161
      weed/shell/command_ec_test.go

118
weed/shell/command_ec_common.go
View File

@ -39,8 +39,6 @@ type EcRack struct {
freeEcSlot int freeEcSlot int
} }
// TODO: We're shuffling way too many parameters between internal functions. Encapsulate in a ecBalancer{} struct.
var ( var (
// Overridable functions for testing. // Overridable functions for testing.
getDefaultReplicaPlacement = _getDefaultReplicaPlacement getDefaultReplicaPlacement = _getDefaultReplicaPlacement
@ -421,10 +419,16 @@ func groupBy(data []*EcNode, identifierFn func(*EcNode) (id string)) map[string]
return groupMap return groupMap
} }
func collectRacks(allEcNodes []*EcNode) map[RackId]*EcRack {
// collect racks info
type ecBalancer struct {
commandEnv *CommandEnv
ecNodes []*EcNode
replicaPlacement *super_block.ReplicaPlacement
applyBalancing bool
}
func (ecb *ecBalancer) racks() map[RackId]*EcRack {
racks := make(map[RackId]*EcRack) racks := make(map[RackId]*EcRack)
for _, ecNode := range allEcNodes {
for _, ecNode := range ecb.ecNodes {
if racks[ecNode.rack] == nil { if racks[ecNode.rack] == nil {
racks[ecNode.rack] = &EcRack{ racks[ecNode.rack] = &EcRack{
ecNodes: make(map[EcNodeId]*EcNode), ecNodes: make(map[EcNodeId]*EcNode),
@ -436,39 +440,38 @@ func collectRacks(allEcNodes []*EcNode) map[RackId]*EcRack {
return racks return racks
} }
func balanceEcVolumes(commandEnv *CommandEnv, collection string, allEcNodes []*EcNode, racks map[RackId]*EcRack, rp *super_block.ReplicaPlacement, applyBalancing bool) error {
func (ecb *ecBalancer) balanceEcVolumes(collection string) error {
fmt.Printf("balanceEcVolumes %s\n", collection) fmt.Printf("balanceEcVolumes %s\n", collection)
if err := deleteDuplicatedEcShards(commandEnv, allEcNodes, collection, applyBalancing); err != nil {
if err := ecb.deleteDuplicatedEcShards(collection); err != nil {
return fmt.Errorf("delete duplicated collection %s ec shards: %v", collection, err) return fmt.Errorf("delete duplicated collection %s ec shards: %v", collection, err)
} }
if err := balanceEcShardsAcrossRacks(commandEnv, allEcNodes, racks, collection, rp, applyBalancing); err != nil {
if err := ecb.balanceEcShardsAcrossRacks(collection); err != nil {
return fmt.Errorf("balance across racks collection %s ec shards: %v", collection, err) return fmt.Errorf("balance across racks collection %s ec shards: %v", collection, err)
} }
if err := balanceEcShardsWithinRacks(commandEnv, allEcNodes, racks, collection, rp, applyBalancing); err != nil {
if err := ecb.balanceEcShardsWithinRacks(collection); err != nil {
return fmt.Errorf("balance within racks collection %s ec shards: %v", collection, err) return fmt.Errorf("balance within racks collection %s ec shards: %v", collection, err)
} }
return nil return nil
} }
func deleteDuplicatedEcShards(commandEnv *CommandEnv, allEcNodes []*EcNode, collection string, applyBalancing bool) error {
func (ecb *ecBalancer) deleteDuplicatedEcShards(collection string) error {
// vid => []ecNode // vid => []ecNode
vidLocations := collectVolumeIdToEcNodes(allEcNodes, collection)
vidLocations := ecb.collectVolumeIdToEcNodes(collection)
// deduplicate ec shards // deduplicate ec shards
for vid, locations := range vidLocations { for vid, locations := range vidLocations {
if err := doDeduplicateEcShards(commandEnv, collection, vid, locations, applyBalancing); err != nil {
if err := ecb.doDeduplicateEcShards(collection, vid, locations); err != nil {
return err return err
} }
} }
return nil return nil
} }
func doDeduplicateEcShards(commandEnv *CommandEnv, collection string, vid needle.VolumeId, locations []*EcNode, applyBalancing bool) error {
func (ecb *ecBalancer) doDeduplicateEcShards(collection string, vid needle.VolumeId, locations []*EcNode) error {
// check whether this volume has ecNodes that are over average // check whether this volume has ecNodes that are over average
shardToLocations := make([][]*EcNode, erasure_coding.TotalShardsCount) shardToLocations := make([][]*EcNode, erasure_coding.TotalShardsCount)
for _, ecNode := range locations { for _, ecNode := range locations {
@ -483,16 +486,16 @@ func doDeduplicateEcShards(commandEnv *CommandEnv, collection string, vid needle
} }
sortEcNodesByFreeslotsAscending(ecNodes) sortEcNodesByFreeslotsAscending(ecNodes)
fmt.Printf("ec shard %d.%d has %d copies, keeping %v\n", vid, shardId, len(ecNodes), ecNodes[0].info.Id) fmt.Printf("ec shard %d.%d has %d copies, keeping %v\n", vid, shardId, len(ecNodes), ecNodes[0].info.Id)
if !applyBalancing {
if !ecb.applyBalancing {
continue continue
} }
duplicatedShardIds := []uint32{uint32(shardId)} duplicatedShardIds := []uint32{uint32(shardId)}
for _, ecNode := range ecNodes[1:] { for _, ecNode := range ecNodes[1:] {
if err := unmountEcShards(commandEnv.option.GrpcDialOption, vid, pb.NewServerAddressFromDataNode(ecNode.info), duplicatedShardIds); err != nil {
if err := unmountEcShards(ecb.commandEnv.option.GrpcDialOption, vid, pb.NewServerAddressFromDataNode(ecNode.info), duplicatedShardIds); err != nil {
return err return err
} }
if err := sourceServerDeleteEcShards(commandEnv.option.GrpcDialOption, collection, vid, pb.NewServerAddressFromDataNode(ecNode.info), duplicatedShardIds); err != nil {
if err := sourceServerDeleteEcShards(ecb.commandEnv.option.GrpcDialOption, collection, vid, pb.NewServerAddressFromDataNode(ecNode.info), duplicatedShardIds); err != nil {
return err return err
} }
ecNode.deleteEcVolumeShards(vid, duplicatedShardIds) ecNode.deleteEcVolumeShards(vid, duplicatedShardIds)
@ -501,12 +504,12 @@ func doDeduplicateEcShards(commandEnv *CommandEnv, collection string, vid needle
return nil return nil
} }
func balanceEcShardsAcrossRacks(commandEnv *CommandEnv, allEcNodes []*EcNode, racks map[RackId]*EcRack, collection string, rp *super_block.ReplicaPlacement, applyBalancing bool) error {
func (ecb *ecBalancer) balanceEcShardsAcrossRacks(collection string) error {
// collect vid => []ecNode, since previous steps can change the locations // collect vid => []ecNode, since previous steps can change the locations
vidLocations := collectVolumeIdToEcNodes(allEcNodes, collection)
vidLocations := ecb.collectVolumeIdToEcNodes(collection)
// spread the ec shards evenly // spread the ec shards evenly
for vid, locations := range vidLocations { for vid, locations := range vidLocations {
if err := doBalanceEcShardsAcrossRacks(commandEnv, collection, vid, locations, racks, rp, applyBalancing); err != nil {
if err := ecb.doBalanceEcShardsAcrossRacks(collection, vid, locations); err != nil {
return err return err
} }
} }
@ -521,7 +524,9 @@ func countShardsByRack(vid needle.VolumeId, locations []*EcNode) map[string]int
} }
// TODO: Maybe remove averages constraints? We don't need those anymore now that we're properly balancing shards. // TODO: Maybe remove averages constraints? We don't need those anymore now that we're properly balancing shards.
func doBalanceEcShardsAcrossRacks(commandEnv *CommandEnv, collection string, vid needle.VolumeId, locations []*EcNode, racks map[RackId]*EcRack, rp *super_block.ReplicaPlacement, applyBalancing bool) error {
func (ecb *ecBalancer) doBalanceEcShardsAcrossRacks(collection string, vid needle.VolumeId, locations []*EcNode) error {
racks := ecb.racks()
// calculate average number of shards an ec rack should have for one volume // calculate average number of shards an ec rack should have for one volume
averageShardsPerEcRack := ceilDivide(erasure_coding.TotalShardsCount, len(racks)) averageShardsPerEcRack := ceilDivide(erasure_coding.TotalShardsCount, len(racks))
@ -544,7 +549,7 @@ func doBalanceEcShardsAcrossRacks(commandEnv *CommandEnv, collection string, vid
} }
for shardId, ecNode := range ecShardsToMove { for shardId, ecNode := range ecShardsToMove {
rackId, err := pickRackToBalanceShardsInto(racks, rackToShardCount, rp, averageShardsPerEcRack)
rackId, err := ecb.pickRackToBalanceShardsInto(racks, rackToShardCount, averageShardsPerEcRack)
if err != nil { if err != nil {
fmt.Printf("ec shard %d.%d at %s can not find a destination rack:\n%s\n", vid, shardId, ecNode.info.Id, err.Error()) fmt.Printf("ec shard %d.%d at %s can not find a destination rack:\n%s\n", vid, shardId, ecNode.info.Id, err.Error())
continue continue
@ -554,7 +559,7 @@ func doBalanceEcShardsAcrossRacks(commandEnv *CommandEnv, collection string, vid
for _, n := range racks[rackId].ecNodes { for _, n := range racks[rackId].ecNodes {
possibleDestinationEcNodes = append(possibleDestinationEcNodes, n) possibleDestinationEcNodes = append(possibleDestinationEcNodes, n)
} }
err = pickOneEcNodeAndMoveOneShard(commandEnv, averageShardsPerEcRack, ecNode, collection, vid, shardId, possibleDestinationEcNodes, rp, applyBalancing)
err = ecb.pickOneEcNodeAndMoveOneShard(averageShardsPerEcRack, ecNode, collection, vid, shardId, possibleDestinationEcNodes)
if err != nil { if err != nil {
return err return err
} }
@ -567,7 +572,7 @@ func doBalanceEcShardsAcrossRacks(commandEnv *CommandEnv, collection string, vid
return nil return nil
} }
func pickRackToBalanceShardsInto(rackToEcNodes map[RackId]*EcRack, rackToShardCount map[string]int, replicaPlacement *super_block.ReplicaPlacement, averageShardsPerEcRack int) (RackId, error) {
func (ecb *ecBalancer) pickRackToBalanceShardsInto(rackToEcNodes map[RackId]*EcRack, rackToShardCount map[string]int, averageShardsPerEcRack int) (RackId, error) {
targets := []RackId{} targets := []RackId{}
targetShards := -1 targetShards := -1
for _, shards := range rackToShardCount { for _, shards := range rackToShardCount {
@ -584,8 +589,8 @@ func pickRackToBalanceShardsInto(rackToEcNodes map[RackId]*EcRack, rackToShardCo
details += fmt.Sprintf(" Skipped %s because it has no free slots\n", rackId) details += fmt.Sprintf(" Skipped %s because it has no free slots\n", rackId)
continue continue
} }
if replicaPlacement != nil && shards >= replicaPlacement.DiffRackCount {
details += fmt.Sprintf(" Skipped %s because shards %d >= replica placement limit for other racks (%d)\n", rackId, shards, replicaPlacement.DiffRackCount)
if ecb.replicaPlacement != nil && shards >= ecb.replicaPlacement.DiffRackCount {
details += fmt.Sprintf(" Skipped %s because shards %d >= replica placement limit for other racks (%d)\n", rackId, shards, ecb.replicaPlacement.DiffRackCount)
continue continue
} }
if shards >= averageShardsPerEcRack { if shards >= averageShardsPerEcRack {
@ -608,9 +613,10 @@ func pickRackToBalanceShardsInto(rackToEcNodes map[RackId]*EcRack, rackToShardCo
return targets[rand.IntN(len(targets))], nil return targets[rand.IntN(len(targets))], nil
} }
func balanceEcShardsWithinRacks(commandEnv *CommandEnv, allEcNodes []*EcNode, racks map[RackId]*EcRack, collection string, rp *super_block.ReplicaPlacement, applyBalancing bool) error {
func (ecb *ecBalancer) balanceEcShardsWithinRacks(collection string) error {
// collect vid => []ecNode, since previous steps can change the locations // collect vid => []ecNode, since previous steps can change the locations
vidLocations := collectVolumeIdToEcNodes(allEcNodes, collection)
vidLocations := ecb.collectVolumeIdToEcNodes(collection)
racks := ecb.racks()
// spread the ec shards evenly // spread the ec shards evenly
for vid, locations := range vidLocations { for vid, locations := range vidLocations {
@ -631,7 +637,7 @@ func balanceEcShardsWithinRacks(commandEnv *CommandEnv, allEcNodes []*EcNode, ra
} }
sourceEcNodes := rackEcNodesWithVid[rackId] sourceEcNodes := rackEcNodesWithVid[rackId]
averageShardsPerEcNode := ceilDivide(rackToShardCount[rackId], len(possibleDestinationEcNodes)) averageShardsPerEcNode := ceilDivide(rackToShardCount[rackId], len(possibleDestinationEcNodes))
if err := doBalanceEcShardsWithinOneRack(commandEnv, averageShardsPerEcNode, collection, vid, sourceEcNodes, possibleDestinationEcNodes, rp, applyBalancing); err != nil {
if err := ecb.doBalanceEcShardsWithinOneRack(averageShardsPerEcNode, collection, vid, sourceEcNodes, possibleDestinationEcNodes); err != nil {
return err return err
} }
} }
@ -639,8 +645,7 @@ func balanceEcShardsWithinRacks(commandEnv *CommandEnv, allEcNodes []*EcNode, ra
return nil return nil
} }
func doBalanceEcShardsWithinOneRack(commandEnv *CommandEnv, averageShardsPerEcNode int, collection string, vid needle.VolumeId, existingLocations, possibleDestinationEcNodes []*EcNode, rp *super_block.ReplicaPlacement, applyBalancing bool) error {
func (ecb *ecBalancer) doBalanceEcShardsWithinOneRack(averageShardsPerEcNode int, collection string, vid needle.VolumeId, existingLocations, possibleDestinationEcNodes []*EcNode) error {
for _, ecNode := range existingLocations { for _, ecNode := range existingLocations {
shardBits := findEcVolumeShards(ecNode, vid) shardBits := findEcVolumeShards(ecNode, vid)
@ -654,7 +659,7 @@ func doBalanceEcShardsWithinOneRack(commandEnv *CommandEnv, averageShardsPerEcNo
fmt.Printf("%s has %d overlimit, moving ec shard %d.%d\n", ecNode.info.Id, overLimitCount, vid, shardId) fmt.Printf("%s has %d overlimit, moving ec shard %d.%d\n", ecNode.info.Id, overLimitCount, vid, shardId)
err := pickOneEcNodeAndMoveOneShard(commandEnv, averageShardsPerEcNode, ecNode, collection, vid, shardId, possibleDestinationEcNodes, rp, applyBalancing)
err := ecb.pickOneEcNodeAndMoveOneShard(averageShardsPerEcNode, ecNode, collection, vid, shardId, possibleDestinationEcNodes)
if err != nil { if err != nil {
return err return err
} }
@ -666,19 +671,17 @@ func doBalanceEcShardsWithinOneRack(commandEnv *CommandEnv, averageShardsPerEcNo
return nil return nil
} }
func balanceEcRacks(commandEnv *CommandEnv, racks map[RackId]*EcRack, applyBalancing bool) error {
func (ecb *ecBalancer) balanceEcRacks() error {
// balance one rack for all ec shards // balance one rack for all ec shards
for _, ecRack := range racks {
if err := doBalanceEcRack(commandEnv, ecRack, applyBalancing); err != nil {
for _, ecRack := range ecb.racks() {
if err := ecb.doBalanceEcRack(ecRack); err != nil {
return err return err
} }
} }
return nil return nil
} }
func doBalanceEcRack(commandEnv *CommandEnv, ecRack *EcRack, applyBalancing bool) error {
func (ecb *ecBalancer) doBalanceEcRack(ecRack *EcRack) error {
if len(ecRack.ecNodes) <= 1 { if len(ecRack.ecNodes) <= 1 {
return nil return nil
} }
@ -729,7 +732,7 @@ func doBalanceEcRack(commandEnv *CommandEnv, ecRack *EcRack, applyBalancing bool
fmt.Printf("%s moves ec shards %d.%d to %s\n", fullNode.info.Id, shards.Id, shardId, emptyNode.info.Id) fmt.Printf("%s moves ec shards %d.%d to %s\n", fullNode.info.Id, shards.Id, shardId, emptyNode.info.Id)
err := moveMountedShardToEcNode(commandEnv, fullNode, shards.Collection, needle.VolumeId(shards.Id), shardId, emptyNode, applyBalancing)
err := moveMountedShardToEcNode(ecb.commandEnv, fullNode, shards.Collection, needle.VolumeId(shards.Id), shardId, emptyNode, ecb.applyBalancing)
if err != nil { if err != nil {
return err return err
} }
@ -749,7 +752,7 @@ func doBalanceEcRack(commandEnv *CommandEnv, ecRack *EcRack, applyBalancing bool
return nil return nil
} }
func pickEcNodeToBalanceShardsInto(vid needle.VolumeId, existingLocation *EcNode, possibleDestinations []*EcNode, replicaPlacement *super_block.ReplicaPlacement, averageShardsPerEcNode int) (*EcNode, error) {
func (ecb *ecBalancer) pickEcNodeToBalanceShardsInto(vid needle.VolumeId, existingLocation *EcNode, possibleDestinations []*EcNode, averageShardsPerEcNode int) (*EcNode, error) {
if existingLocation == nil { if existingLocation == nil {
return nil, fmt.Errorf("INTERNAL: missing source nodes") return nil, fmt.Errorf("INTERNAL: missing source nodes")
} }
@ -781,8 +784,8 @@ func pickEcNodeToBalanceShardsInto(vid needle.VolumeId, existingLocation *EcNode
} }
shards := nodeShards[node] shards := nodeShards[node]
if replicaPlacement != nil && shards >= replicaPlacement.SameRackCount {
details += fmt.Sprintf(" Skipped %s because shards %d >= replica placement limit for the rack (%d)\n", node.info.Id, shards, replicaPlacement.SameRackCount)
if ecb.replicaPlacement != nil && shards >= ecb.replicaPlacement.SameRackCount {
details += fmt.Sprintf(" Skipped %s because shards %d >= replica placement limit for the rack (%d)\n", node.info.Id, shards, ecb.replicaPlacement.SameRackCount)
continue continue
} }
if shards >= averageShardsPerEcNode { if shards >= averageShardsPerEcNode {
@ -808,15 +811,15 @@ func pickEcNodeToBalanceShardsInto(vid needle.VolumeId, existingLocation *EcNode
} }
// TODO: Maybe remove averages constraints? We don't need those anymore now that we're properly balancing shards. // TODO: Maybe remove averages constraints? We don't need those anymore now that we're properly balancing shards.
func pickOneEcNodeAndMoveOneShard(commandEnv *CommandEnv, averageShardsPerEcNode int, existingLocation *EcNode, collection string, vid needle.VolumeId, shardId erasure_coding.ShardId, possibleDestinationEcNodes []*EcNode, rp *super_block.ReplicaPlacement, applyBalancing bool) error {
destNode, err := pickEcNodeToBalanceShardsInto(vid, existingLocation, possibleDestinationEcNodes, rp, averageShardsPerEcNode)
func (ecb *ecBalancer) pickOneEcNodeAndMoveOneShard(averageShardsPerEcNode int, existingLocation *EcNode, collection string, vid needle.VolumeId, shardId erasure_coding.ShardId, possibleDestinationEcNodes []*EcNode) error {
destNode, err := ecb.pickEcNodeToBalanceShardsInto(vid, existingLocation, possibleDestinationEcNodes, averageShardsPerEcNode)
if err != nil { if err != nil {
fmt.Printf("WARNING: Could not find suitable taget node for %d.%d:\n%s", vid, shardId, err.Error()) fmt.Printf("WARNING: Could not find suitable taget node for %d.%d:\n%s", vid, shardId, err.Error())
return nil return nil
} }
fmt.Printf("%s moves ec shard %d.%d to %s\n", existingLocation.info.Id, vid, shardId, destNode.info.Id) fmt.Printf("%s moves ec shard %d.%d to %s\n", existingLocation.info.Id, vid, shardId, destNode.info.Id)
return moveMountedShardToEcNode(commandEnv, existingLocation, collection, vid, shardId, destNode, applyBalancing)
return moveMountedShardToEcNode(ecb.commandEnv, existingLocation, collection, vid, shardId, destNode, ecb.applyBalancing)
} }
func pickNEcShardsToMoveFrom(ecNodes []*EcNode, vid needle.VolumeId, n int) map[erasure_coding.ShardId]*EcNode { func pickNEcShardsToMoveFrom(ecNodes []*EcNode, vid needle.VolumeId, n int) map[erasure_coding.ShardId]*EcNode {
@ -859,9 +862,9 @@ func pickNEcShardsToMoveFrom(ecNodes []*EcNode, vid needle.VolumeId, n int) map[
return picked return picked
} }
func collectVolumeIdToEcNodes(allEcNodes []*EcNode, collection string) map[needle.VolumeId][]*EcNode {
func (ecb *ecBalancer) collectVolumeIdToEcNodes(collection string) map[needle.VolumeId][]*EcNode {
vidLocations := make(map[needle.VolumeId][]*EcNode) vidLocations := make(map[needle.VolumeId][]*EcNode)
for _, ecNode := range allEcNodes {
for _, ecNode := range ecb.ecNodes {
diskInfo, found := ecNode.info.DiskInfos[string(types.HardDriveType)] diskInfo, found := ecNode.info.DiskInfos[string(types.HardDriveType)]
if !found { if !found {
continue continue
@ -876,9 +879,9 @@ func collectVolumeIdToEcNodes(allEcNodes []*EcNode, collection string) map[needl
return vidLocations return vidLocations
} }
// TODO: EC volumes have no topology replica placement info :( We need a better solution to resolve topology, and balancing, for those.
func volumeIdToReplicaPlacement(commandEnv *CommandEnv, vid needle.VolumeId, nodes []*EcNode, ecReplicaPlacement *super_block.ReplicaPlacement) (*super_block.ReplicaPlacement, error) {
for _, ecNode := range nodes {
// TODO: Unused, delete me.
func (ecb *ecBalancer) volumeIdToReplicaPlacement(vid needle.VolumeId) (*super_block.ReplicaPlacement, error) {
for _, ecNode := range ecb.ecNodes {
for _, diskInfo := range ecNode.info.DiskInfos { for _, diskInfo := range ecNode.info.DiskInfos {
for _, volumeInfo := range diskInfo.VolumeInfos { for _, volumeInfo := range diskInfo.VolumeInfos {
if needle.VolumeId(volumeInfo.Id) == vid { if needle.VolumeId(volumeInfo.Id) == vid {
@ -887,7 +890,7 @@ func volumeIdToReplicaPlacement(commandEnv *CommandEnv, vid needle.VolumeId, nod
} }
for _, ecShardInfo := range diskInfo.EcShardInfos { for _, ecShardInfo := range diskInfo.EcShardInfos {
if needle.VolumeId(ecShardInfo.Id) == vid { if needle.VolumeId(ecShardInfo.Id) == vid {
return ecReplicaPlacement, nil
return ecb.replicaPlacement, nil
} }
} }
} }
@ -910,14 +913,19 @@ func EcBalance(commandEnv *CommandEnv, collections []string, dc string, ecReplic
return fmt.Errorf("no free ec shard slots. only %d left", totalFreeEcSlots) return fmt.Errorf("no free ec shard slots. only %d left", totalFreeEcSlots)
} }
racks := collectRacks(allEcNodes)
ecb := &ecBalancer{
commandEnv: commandEnv,
ecNodes: allEcNodes,
replicaPlacement: ecReplicaPlacement,
applyBalancing: applyBalancing,
}
for _, c := range collections { for _, c := range collections {
if err = balanceEcVolumes(commandEnv, c, allEcNodes, racks, ecReplicaPlacement, applyBalancing); err != nil {
if err = ecb.balanceEcVolumes(c); err != nil {
return err return err
} }
} }
if err := balanceEcRacks(commandEnv, racks, applyBalancing); err != nil {
if err := ecb.balanceEcRacks(); err != nil {
return fmt.Errorf("balance ec racks: %v", err) return fmt.Errorf("balance ec racks: %v", err)
} }

97
weed/shell/command_ec_common_test.go
View File

@ -114,10 +114,15 @@ func TestVolumeIdToReplicaPlacement(t *testing.T) {
} }
for _, tc := range testCases { for _, tc := range testCases {
commandEnv := &CommandEnv{}
vid, _ := needle.NewVolumeId(tc.vid) vid, _ := needle.NewVolumeId(tc.vid)
ecNodes, _ := collectEcVolumeServersByDc(tc.topology, "") ecNodes, _ := collectEcVolumeServersByDc(tc.topology, "")
got, gotErr := volumeIdToReplicaPlacement(commandEnv, vid, ecNodes, ecReplicaPlacement)
ecb := ecBalancer{
ecNodes: ecNodes,
replicaPlacement: ecReplicaPlacement,
}
got, gotErr := ecb.volumeIdToReplicaPlacement(vid)
if err := errorCheck(gotErr, tc.wantErr); err != nil { if err := errorCheck(gotErr, tc.wantErr); err != nil {
t.Errorf("volume %q: %s", tc.vid, err.Error()) t.Errorf("volume %q: %s", tc.vid, err.Error())
@ -163,14 +168,18 @@ func TestPickRackToBalanceShardsInto(t *testing.T) {
for _, tc := range testCases { for _, tc := range testCases {
vid, _ := needle.NewVolumeId(tc.vid) vid, _ := needle.NewVolumeId(tc.vid)
ecNodes, _ := collectEcVolumeServersByDc(tc.topology, "") ecNodes, _ := collectEcVolumeServersByDc(tc.topology, "")
racks := collectRacks(ecNodes)
rp, _ := super_block.NewReplicaPlacementFromString(tc.replicaPlacement) rp, _ := super_block.NewReplicaPlacementFromString(tc.replicaPlacement)
locations := ecNodes
rackToShardCount := countShardsByRack(vid, locations)
ecb := &ecBalancer{
ecNodes: ecNodes,
replicaPlacement: rp,
}
racks := ecb.racks()
rackToShardCount := countShardsByRack(vid, ecNodes)
averageShardsPerEcRack := ceilDivide(erasure_coding.TotalShardsCount, len(racks)) averageShardsPerEcRack := ceilDivide(erasure_coding.TotalShardsCount, len(racks))
got, gotErr := pickRackToBalanceShardsInto(racks, rackToShardCount, rp, averageShardsPerEcRack)
got, gotErr := ecb.pickRackToBalanceShardsInto(racks, rackToShardCount, averageShardsPerEcRack)
if err := errorCheck(gotErr, tc.wantErr); err != nil { if err := errorCheck(gotErr, tc.wantErr); err != nil {
t.Errorf("volume %q: %s", tc.vid, err.Error()) t.Errorf("volume %q: %s", tc.vid, err.Error())
continue continue
@ -193,27 +202,25 @@ func TestPickRackToBalanceShardsInto(t *testing.T) {
} }
func TestPickEcNodeToBalanceShardsInto(t *testing.T) { func TestPickEcNodeToBalanceShardsInto(t *testing.T) {
testCases := []struct { testCases := []struct {
topology *master_pb.TopologyInfo
nodeId string
vid string
replicaPlacement string
wantOneOf []string
wantErr string
topology *master_pb.TopologyInfo
nodeId string
vid string
wantOneOf []string
wantErr string
}{ }{
{topologyEc, "", "", "", nil, "INTERNAL: missing source nodes"},
{topologyEc, "idontexist", "12737", "", nil, "INTERNAL: missing source nodes"},
{topologyEc, "", "", nil, "INTERNAL: missing source nodes"},
{topologyEc, "idontexist", "12737", nil, "INTERNAL: missing source nodes"},
// Non-EC nodes. We don't care about these, but the function should return all available target nodes as a safeguard. // Non-EC nodes. We don't care about these, but the function should return all available target nodes as a safeguard.
{ {
topologyEc, "172.19.0.10:8702", "6225", "123",
[]string{
topologyEc, "172.19.0.10:8702", "6225", []string{
"172.19.0.13:8701", "172.19.0.14:8711", "172.19.0.16:8704", "172.19.0.17:8703", "172.19.0.13:8701", "172.19.0.14:8711", "172.19.0.16:8704", "172.19.0.17:8703",
"172.19.0.19:8700", "172.19.0.20:8706", "172.19.0.21:8710", "172.19.0.3:8708", "172.19.0.19:8700", "172.19.0.20:8706", "172.19.0.21:8710", "172.19.0.3:8708",
"172.19.0.4:8707", "172.19.0.5:8705", "172.19.0.6:8713", "172.19.0.8:8709", "172.19.0.4:8707", "172.19.0.5:8705", "172.19.0.6:8713", "172.19.0.8:8709",
"172.19.0.9:8712"}, "172.19.0.9:8712"},
"", "",
}, {
topologyEc, "172.19.0.8:8709", "6226", "123",
[]string{
},
{
topologyEc, "172.19.0.8:8709", "6226", []string{
"172.19.0.10:8702", "172.19.0.13:8701", "172.19.0.14:8711", "172.19.0.16:8704", "172.19.0.10:8702", "172.19.0.13:8701", "172.19.0.14:8711", "172.19.0.16:8704",
"172.19.0.17:8703", "172.19.0.19:8700", "172.19.0.20:8706", "172.19.0.21:8710", "172.19.0.17:8703", "172.19.0.19:8700", "172.19.0.20:8706", "172.19.0.21:8710",
"172.19.0.3:8708", "172.19.0.4:8707", "172.19.0.5:8705", "172.19.0.6:8713", "172.19.0.3:8708", "172.19.0.4:8707", "172.19.0.5:8705", "172.19.0.6:8713",
@ -221,45 +228,27 @@ func TestPickEcNodeToBalanceShardsInto(t *testing.T) {
"", "",
}, },
// EC volumes. // EC volumes.
{
topologyEc, "172.19.0.10:8702", "14322", "",
nil, "Skipped 172.19.0.13:8701 because shards 1 >= replica placement limit for the rack (0)",
}, {
topologyEc, "172.19.0.10:8702", "14322", "210",
nil, "Skipped 172.19.0.5:8705 because shards 0 >= replica placement limit for the rack (0)",
}, {
topologyEc, "172.19.0.10:8702", "9577", "110",
nil, "Skipped 172.19.0.4:8707 because shards 1 >= replica placement limit for the rack (0)",
}, {
topologyEc, "172.19.0.10:8702", "9577", "111",
nil, "Skipped 172.19.0.4:8707 because shards 1 >= replica placement limit for the rack (1)",
}, {
topologyEc, "172.19.0.10:8702", "9577", "113",
[]string{
"172.19.0.13:8701", "172.19.0.14:8711", "172.19.0.16:8704", "172.19.0.17:8703",
"172.19.0.19:8700", "172.19.0.20:8706", "172.19.0.21:8710", "172.19.0.3:8708",
"172.19.0.4:8707", "172.19.0.5:8705", "172.19.0.6:8713", "172.19.0.8:8709",
"172.19.0.9:8712"},
"",
}, {
topologyEc, "172.19.0.10:8702", "14322", "222",
[]string{"172.19.0.14:8711", "172.19.0.5:8705", "172.19.0.6:8713"}, "",
}, {
topologyEc, "172.19.0.13:8701", "10457", "222",
[]string{"172.19.0.10:8702", "172.19.0.6:8713"}, "",
}, {
topologyEc, "172.19.0.17:8703", "12737", "222",
[]string{"172.19.0.13:8701"}, "",
}, {
topologyEc, "172.19.0.20:8706", "14322", "222",
[]string{"172.19.0.14:8711", "172.19.0.5:8705", "172.19.0.6:8713"}, "",
},
{topologyEc, "172.19.0.10:8702", "14322", []string{
"172.19.0.14:8711", "172.19.0.5:8705", "172.19.0.6:8713"},
""},
{topologyEc, "172.19.0.13:8701", "10457", []string{
"172.19.0.10:8702", "172.19.0.6:8713"},
""},
{topologyEc, "172.19.0.17:8703", "12737", []string{
"172.19.0.13:8701"},
""},
{topologyEc, "172.19.0.20:8706", "14322", []string{
"172.19.0.14:8711", "172.19.0.5:8705", "172.19.0.6:8713"},
""},
} }
for _, tc := range testCases { for _, tc := range testCases {
vid, _ := needle.NewVolumeId(tc.vid) vid, _ := needle.NewVolumeId(tc.vid)
allEcNodes, _ := collectEcVolumeServersByDc(tc.topology, "") allEcNodes, _ := collectEcVolumeServersByDc(tc.topology, "")
rp, _ := super_block.NewReplicaPlacementFromString(tc.replicaPlacement)
ecb := &ecBalancer{
ecNodes: allEcNodes,
}
// Resolve target node by name // Resolve target node by name
var ecNode *EcNode var ecNode *EcNode
@ -271,7 +260,7 @@ func TestPickEcNodeToBalanceShardsInto(t *testing.T) {
} }
averageShardsPerEcNode := 5 averageShardsPerEcNode := 5
got, gotErr := pickEcNodeToBalanceShardsInto(vid, ecNode, allEcNodes, rp, averageShardsPerEcNode)
got, gotErr := ecb.pickEcNodeToBalanceShardsInto(vid, ecNode, allEcNodes, averageShardsPerEcNode)
if err := errorCheck(gotErr, tc.wantErr); err != nil { if err := errorCheck(gotErr, tc.wantErr); err != nil {
t.Errorf("node %q, volume %q: %s", tc.nodeId, tc.vid, err.Error()) t.Errorf("node %q, volume %q: %s", tc.nodeId, tc.vid, err.Error())
continue continue

161
weed/shell/command_ec_test.go
View File

@ -21,106 +21,111 @@ func TestCommandEcDistribution(t *testing.T) {
} }
func TestCommandEcBalanceSmall(t *testing.T) { func TestCommandEcBalanceSmall(t *testing.T) {
allEcNodes := []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack2", "dn2", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}),
ecb := &ecBalancer{
ecNodes: []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack2", "dn2", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}),
},
applyBalancing: false,
} }
racks := collectRacks(allEcNodes)
balanceEcVolumes(nil, "c1", allEcNodes, racks, nil, false)
ecb.balanceEcVolumes("c1")
} }
func TestCommandEcBalanceNothingToMove(t *testing.T) { func TestCommandEcBalanceNothingToMove(t *testing.T) {
allEcNodes := []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack1", "dn2", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}),
ecb := &ecBalancer{
ecNodes: []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack1", "dn2", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}),
},
applyBalancing: false,
} }
racks := collectRacks(allEcNodes)
balanceEcVolumes(nil, "c1", allEcNodes, racks, nil, false)
ecb.balanceEcVolumes("c1")
} }
func TestCommandEcBalanceAddNewServers(t *testing.T) { func TestCommandEcBalanceAddNewServers(t *testing.T) {
allEcNodes := []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack1", "dn2", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}),
newEcNode("dc1", "rack1", "dn3", 100),
newEcNode("dc1", "rack1", "dn4", 100),
ecb := &ecBalancer{
ecNodes: []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack1", "dn2", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}),
newEcNode("dc1", "rack1", "dn3", 100),
newEcNode("dc1", "rack1", "dn4", 100),
},
applyBalancing: false,
} }
racks := collectRacks(allEcNodes)
balanceEcVolumes(nil, "c1", allEcNodes, racks, nil, false)
ecb.balanceEcVolumes("c1")
} }
func TestCommandEcBalanceAddNewRacks(t *testing.T) { func TestCommandEcBalanceAddNewRacks(t *testing.T) {
allEcNodes := []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack1", "dn2", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}),
newEcNode("dc1", "rack2", "dn3", 100),
newEcNode("dc1", "rack2", "dn4", 100),
ecb := &ecBalancer{
ecNodes: []*EcNode{
newEcNode("dc1", "rack1", "dn1", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}),
newEcNode("dc1", "rack1", "dn2", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{7, 8, 9, 10, 11, 12, 13}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0, 1, 2, 3, 4, 5, 6}),
newEcNode("dc1", "rack2", "dn3", 100),
newEcNode("dc1", "rack2", "dn4", 100),
},
applyBalancing: false,
} }
racks := collectRacks(allEcNodes)
balanceEcVolumes(nil, "c1", allEcNodes, racks, nil, false)
ecb.balanceEcVolumes("c1")
} }
func TestCommandEcBalanceVolumeEvenButRackUneven(t *testing.T) { func TestCommandEcBalanceVolumeEvenButRackUneven(t *testing.T) {
allEcNodes := []*EcNode{
newEcNode("dc1", "rack1", "dn_shared", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0}),
newEcNode("dc1", "rack1", "dn_a1", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{1}),
newEcNode("dc1", "rack1", "dn_a2", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{2}),
newEcNode("dc1", "rack1", "dn_a3", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{3}),
newEcNode("dc1", "rack1", "dn_a4", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{4}),
newEcNode("dc1", "rack1", "dn_a5", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{5}),
newEcNode("dc1", "rack1", "dn_a6", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{6}),
newEcNode("dc1", "rack1", "dn_a7", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{7}),
newEcNode("dc1", "rack1", "dn_a8", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{8}),
newEcNode("dc1", "rack1", "dn_a9", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{9}),
newEcNode("dc1", "rack1", "dn_a10", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{10}),
newEcNode("dc1", "rack1", "dn_a11", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{11}),
newEcNode("dc1", "rack1", "dn_a12", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{12}),
newEcNode("dc1", "rack1", "dn_a13", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{13}),
newEcNode("dc1", "rack1", "dn_b1", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{1}),
newEcNode("dc1", "rack1", "dn_b2", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{2}),
newEcNode("dc1", "rack1", "dn_b3", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{3}),
newEcNode("dc1", "rack1", "dn_b4", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{4}),
newEcNode("dc1", "rack1", "dn_b5", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{5}),
newEcNode("dc1", "rack1", "dn_b6", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{6}),
newEcNode("dc1", "rack1", "dn_b7", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{7}),
newEcNode("dc1", "rack1", "dn_b8", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{8}),
newEcNode("dc1", "rack1", "dn_b9", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{9}),
newEcNode("dc1", "rack1", "dn_b10", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{10}),
newEcNode("dc1", "rack1", "dn_b11", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{11}),
newEcNode("dc1", "rack1", "dn_b12", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{12}),
newEcNode("dc1", "rack1", "dn_b13", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{13}),
newEcNode("dc1", "rack1", "dn3", 100),
ecb := ecBalancer{
ecNodes: []*EcNode{
newEcNode("dc1", "rack1", "dn_shared", 100).
addEcVolumeAndShardsForTest(1, "c1", []uint32{0}).
addEcVolumeAndShardsForTest(2, "c1", []uint32{0}),
newEcNode("dc1", "rack1", "dn_a1", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{1}),
newEcNode("dc1", "rack1", "dn_a2", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{2}),
newEcNode("dc1", "rack1", "dn_a3", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{3}),
newEcNode("dc1", "rack1", "dn_a4", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{4}),
newEcNode("dc1", "rack1", "dn_a5", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{5}),
newEcNode("dc1", "rack1", "dn_a6", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{6}),
newEcNode("dc1", "rack1", "dn_a7", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{7}),
newEcNode("dc1", "rack1", "dn_a8", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{8}),
newEcNode("dc1", "rack1", "dn_a9", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{9}),
newEcNode("dc1", "rack1", "dn_a10", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{10}),
newEcNode("dc1", "rack1", "dn_a11", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{11}),
newEcNode("dc1", "rack1", "dn_a12", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{12}),
newEcNode("dc1", "rack1", "dn_a13", 100).addEcVolumeAndShardsForTest(1, "c1", []uint32{13}),
newEcNode("dc1", "rack1", "dn_b1", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{1}),
newEcNode("dc1", "rack1", "dn_b2", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{2}),
newEcNode("dc1", "rack1", "dn_b3", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{3}),
newEcNode("dc1", "rack1", "dn_b4", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{4}),
newEcNode("dc1", "rack1", "dn_b5", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{5}),
newEcNode("dc1", "rack1", "dn_b6", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{6}),
newEcNode("dc1", "rack1", "dn_b7", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{7}),
newEcNode("dc1", "rack1", "dn_b8", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{8}),
newEcNode("dc1", "rack1", "dn_b9", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{9}),
newEcNode("dc1", "rack1", "dn_b10", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{10}),
newEcNode("dc1", "rack1", "dn_b11", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{11}),
newEcNode("dc1", "rack1", "dn_b12", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{12}),
newEcNode("dc1", "rack1", "dn_b13", 100).addEcVolumeAndShardsForTest(2, "c1", []uint32{13}),
newEcNode("dc1", "rack1", "dn3", 100),
},
applyBalancing: false,
} }
racks := collectRacks(allEcNodes)
balanceEcVolumes(nil, "c1", allEcNodes, racks, nil, false)
balanceEcRacks(nil, racks, false)
ecb.balanceEcVolumes("c1")
ecb.balanceEcRacks()
} }
func newEcNode(dc string, rack string, dataNodeId string, freeEcSlot int) *EcNode { func newEcNode(dc string, rack string, dataNodeId string, freeEcSlot int) *EcNode {

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