// Copyright (C) 2019-2020 Zilliz. All rights reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance // with the License. You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software distributed under the License // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express // or implied. See the License for the specific language governing permissions and limitations under the License. package storage import ( "bytes" "encoding/binary" "errors" "io" "github.com/milvus-io/milvus/internal/common" "github.com/milvus-io/milvus/internal/proto/etcdpb" ) // VectorChunkManager is responsible for read and write vector data. type VectorChunkManager struct { localChunkManager ChunkManager remoteChunkManager ChunkManager schema *etcdpb.CollectionMeta localCacheEnable bool } // NewVectorChunkManager create a new vector manager object. func NewVectorChunkManager(localChunkManager ChunkManager, remoteChunkManager ChunkManager, schema *etcdpb.CollectionMeta, localCacheEnable bool) *VectorChunkManager { return &VectorChunkManager{ localChunkManager: localChunkManager, remoteChunkManager: remoteChunkManager, schema: schema, localCacheEnable: localCacheEnable, } } // For vector data, we will download vector file from storage. And we will // deserialize the file for it has binlog style. At last we store pure vector // data to local storage as cache. func (vcm *VectorChunkManager) downloadVectorFile(key string) ([]byte, error) { if vcm.localChunkManager.Exist(key) { return vcm.localChunkManager.Read(key) } insertCodec := NewInsertCodec(vcm.schema) content, err := vcm.remoteChunkManager.Read(key) if err != nil { return nil, err } blob := &Blob{ Key: key, Value: content, } _, _, data, err := insertCodec.Deserialize([]*Blob{blob}) if err != nil { return nil, err } var results []byte for _, singleData := range data.Data { binaryVector, ok := singleData.(*BinaryVectorFieldData) if ok { results = binaryVector.Data } floatVector, ok := singleData.(*FloatVectorFieldData) if ok { buf := new(bytes.Buffer) err := binary.Write(buf, common.Endian, floatVector.Data) if err != nil { return nil, err } results = buf.Bytes() } } return results, nil } // GetPath returns the path of vector data. If cached, return local path. // If not cached return remote path. func (vcm *VectorChunkManager) GetPath(key string) (string, error) { if vcm.localChunkManager.Exist(key) && vcm.localCacheEnable { return vcm.localChunkManager.GetPath(key) } return vcm.remoteChunkManager.GetPath(key) } // Write writes the vector data to local cache if cache enabled. func (vcm *VectorChunkManager) Write(key string, content []byte) error { if !vcm.localCacheEnable { return errors.New("Cannot write local file for local cache is not allowed") } return vcm.localChunkManager.Write(key, content) } // Exist checks whether vector data is saved to local cache. func (vcm *VectorChunkManager) Exist(key string) bool { return vcm.localChunkManager.Exist(key) } // Read reads the pure vector data. If cached, it reads from local. func (vcm *VectorChunkManager) Read(key string) ([]byte, error) { if vcm.localCacheEnable { if vcm.localChunkManager.Exist(key) { return vcm.localChunkManager.Read(key) } bytes, err := vcm.downloadVectorFile(key) if err != nil { return nil, err } err = vcm.localChunkManager.Write(key, bytes) if err != nil { return nil, err } return vcm.localChunkManager.Read(key) } return vcm.downloadVectorFile(key) } // ReadAt reads specific position data of vector. If cached, it reads from local. func (vcm *VectorChunkManager) ReadAt(key string, p []byte, off int64) (int, error) { if vcm.localCacheEnable { if vcm.localChunkManager.Exist(key) { return vcm.localChunkManager.ReadAt(key, p, off) } bytes, err := vcm.downloadVectorFile(key) if err != nil { return -1, err } err = vcm.localChunkManager.Write(key, bytes) if err != nil { return -1, err } return vcm.localChunkManager.ReadAt(key, p, off) } bytes, err := vcm.downloadVectorFile(key) if err != nil { return -1, err } if bytes == nil { return 0, errors.New("vectorChunkManager: data downloaded is nil") } if off < 0 || int64(len(bytes)) < off { return 0, errors.New("vectorChunkManager: invalid offset") } n := copy(p, bytes[off:]) if n < len(p) { return n, io.EOF } return n, nil }