package engine import ( "errors" "fmt" meta "github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase" "github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard" "github.com/TrueCloudLab/frostfs-node/pkg/util" objectSDK "github.com/TrueCloudLab/frostfs-sdk-go/object" oid "github.com/TrueCloudLab/frostfs-sdk-go/object/id" "github.com/TrueCloudLab/hrw" "go.uber.org/zap" ) // EvacuateShardPrm represents parameters for the EvacuateShard operation. type EvacuateShardPrm struct { shardID []*shard.ID handler func(oid.Address, *objectSDK.Object) error ignoreErrors bool } // EvacuateShardRes represents result of the EvacuateShard operation. type EvacuateShardRes struct { count int } // WithShardIDList sets shard ID. func (p *EvacuateShardPrm) WithShardIDList(id []*shard.ID) { p.shardID = id } // WithIgnoreErrors sets flag to ignore errors. func (p *EvacuateShardPrm) WithIgnoreErrors(ignore bool) { p.ignoreErrors = ignore } // WithFaultHandler sets handler to call for objects which cannot be saved on other shards. func (p *EvacuateShardPrm) WithFaultHandler(f func(oid.Address, *objectSDK.Object) error) { p.handler = f } // Count returns amount of evacuated objects. // Objects for which handler returned no error are also assumed evacuated. func (p EvacuateShardRes) Count() int { return p.count } const defaultEvacuateBatchSize = 100 type pooledShard struct { hashedShard pool util.WorkerPool } var errMustHaveTwoShards = errors.New("must have at least 1 spare shard") // Evacuate moves data from one shard to the others. // The shard being moved must be in read-only mode. func (e *StorageEngine) Evacuate(prm EvacuateShardPrm) (EvacuateShardRes, error) { sidList := make([]string, len(prm.shardID)) for i := range prm.shardID { sidList[i] = prm.shardID[i].String() } e.mtx.RLock() for i := range sidList { sh, ok := e.shards[sidList[i]] if !ok { e.mtx.RUnlock() return EvacuateShardRes{}, errShardNotFound } if !sh.GetMode().ReadOnly() { e.mtx.RUnlock() return EvacuateShardRes{}, shard.ErrMustBeReadOnly } } if len(e.shards)-len(sidList) < 1 && prm.handler == nil { e.mtx.RUnlock() return EvacuateShardRes{}, errMustHaveTwoShards } e.log.Info("started shards evacuation", zap.Strings("shard_ids", sidList)) // We must have all shards, to have correct information about their // indexes in a sorted slice and set appropriate marks in the metabase. // Evacuated shard is skipped during put. shards := make([]pooledShard, 0, len(e.shards)) for id := range e.shards { shards = append(shards, pooledShard{ hashedShard: hashedShard(e.shards[id]), pool: e.shardPools[id], }) } e.mtx.RUnlock() weights := make([]float64, 0, len(shards)) for i := range shards { weights = append(weights, e.shardWeight(shards[i].Shard)) } shardMap := make(map[string]*shard.Shard) for i := range sidList { for j := range shards { if shards[j].ID().String() == sidList[i] { shardMap[sidList[i]] = shards[j].Shard } } } var listPrm shard.ListWithCursorPrm listPrm.WithCount(defaultEvacuateBatchSize) var res EvacuateShardRes mainLoop: for n := range sidList { sh := shardMap[sidList[n]] var c *meta.Cursor for { listPrm.WithCursor(c) // TODO (@fyrchik): #1731 this approach doesn't work in degraded modes // because ListWithCursor works only with the metabase. listRes, err := sh.ListWithCursor(listPrm) if err != nil { if errors.Is(err, meta.ErrEndOfListing) || errors.Is(err, shard.ErrDegradedMode) { continue mainLoop } return res, err } // TODO (@fyrchik): #1731 parallelize the loop lst := listRes.AddressList() loop: for i := range lst { addr := lst[i].Address var getPrm shard.GetPrm getPrm.SetAddress(addr) getRes, err := sh.Get(getPrm) if err != nil { if prm.ignoreErrors { continue } return res, err } hrw.SortHasherSliceByWeightValue(shards, weights, hrw.Hash([]byte(addr.EncodeToString()))) for j := range shards { if _, ok := shardMap[shards[j].ID().String()]; ok { continue } putDone, exists := e.putToShard(shards[j].hashedShard, j, shards[j].pool, addr, getRes.Object()) if putDone || exists { if putDone { e.log.Debug("object is moved to another shard", zap.String("from", sidList[n]), zap.Stringer("to", shards[j].ID()), zap.Stringer("addr", addr)) res.count++ } continue loop } } if prm.handler == nil { // Do not check ignoreErrors flag here because // ignoring errors on put make this command kinda useless. return res, fmt.Errorf("%w: %s", errPutShard, lst[i]) } err = prm.handler(addr, getRes.Object()) if err != nil { return res, err } res.count++ } c = listRes.Cursor() } } e.log.Info("finished shards evacuation", zap.Strings("shard_ids", sidList)) return res, nil }