mirror of
https://gitee.com/milvus-io/milvus.git
synced 2024-12-01 11:29:48 +08:00
9d5bcd3e3a
Signed-off-by: godchen <qingxiang.chen@zilliz.com>
162 lines
4.5 KiB
Go
162 lines
4.5 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package storage
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"io"
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"github.com/milvus-io/milvus/internal/common"
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"github.com/milvus-io/milvus/internal/proto/etcdpb"
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)
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// VectorChunkManager is responsible for read and write vector data.
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type VectorChunkManager struct {
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localChunkManager ChunkManager
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remoteChunkManager ChunkManager
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schema *etcdpb.CollectionMeta
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localCacheEnable bool
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}
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// NewVectorChunkManager create a new vector manager object.
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func NewVectorChunkManager(localChunkManager ChunkManager, remoteChunkManager ChunkManager, schema *etcdpb.CollectionMeta, localCacheEnable bool) *VectorChunkManager {
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return &VectorChunkManager{
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localChunkManager: localChunkManager,
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remoteChunkManager: remoteChunkManager,
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schema: schema,
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localCacheEnable: localCacheEnable,
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}
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}
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// For vector data, we will download vector file from storage. And we will
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// deserialize the file for it has binlog style. At last we store pure vector
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// data to local storage as cache.
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func (vcm *VectorChunkManager) downloadVectorFile(key string) ([]byte, error) {
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if vcm.localChunkManager.Exist(key) {
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return vcm.localChunkManager.Read(key)
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}
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insertCodec := NewInsertCodec(vcm.schema)
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content, err := vcm.remoteChunkManager.Read(key)
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if err != nil {
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return nil, err
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}
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blob := &Blob{
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Key: key,
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Value: content,
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}
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_, _, data, err := insertCodec.Deserialize([]*Blob{blob})
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if err != nil {
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return nil, err
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}
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var results []byte
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for _, singleData := range data.Data {
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binaryVector, ok := singleData.(*BinaryVectorFieldData)
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if ok {
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results = binaryVector.Data
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}
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floatVector, ok := singleData.(*FloatVectorFieldData)
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if ok {
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buf := new(bytes.Buffer)
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err := binary.Write(buf, common.Endian, floatVector.Data)
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if err != nil {
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return nil, err
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}
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results = buf.Bytes()
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}
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}
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return results, nil
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}
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// GetPath returns the path of vector data. If cached, return local path.
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// If not cached return remote path.
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func (vcm *VectorChunkManager) GetPath(key string) (string, error) {
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if vcm.localChunkManager.Exist(key) && vcm.localCacheEnable {
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return vcm.localChunkManager.GetPath(key)
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}
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return vcm.remoteChunkManager.GetPath(key)
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}
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// Write writes the vector data to local cache if cache enabled.
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func (vcm *VectorChunkManager) Write(key string, content []byte) error {
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if !vcm.localCacheEnable {
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return errors.New("Cannot write local file for local cache is not allowed")
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}
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return vcm.localChunkManager.Write(key, content)
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}
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// Exist checks whether vector data is saved to local cache.
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func (vcm *VectorChunkManager) Exist(key string) bool {
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return vcm.localChunkManager.Exist(key)
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}
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// Read reads the pure vector data. If cached, it reads from local.
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func (vcm *VectorChunkManager) Read(key string) ([]byte, error) {
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if vcm.localCacheEnable {
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if vcm.localChunkManager.Exist(key) {
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return vcm.localChunkManager.Read(key)
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}
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bytes, err := vcm.downloadVectorFile(key)
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if err != nil {
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return nil, err
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}
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err = vcm.localChunkManager.Write(key, bytes)
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if err != nil {
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return nil, err
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}
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return vcm.localChunkManager.Read(key)
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}
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return vcm.downloadVectorFile(key)
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}
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// ReadAt reads specific position data of vector. If cached, it reads from local.
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func (vcm *VectorChunkManager) ReadAt(key string, p []byte, off int64) (int, error) {
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if vcm.localCacheEnable {
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if vcm.localChunkManager.Exist(key) {
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return vcm.localChunkManager.ReadAt(key, p, off)
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}
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bytes, err := vcm.downloadVectorFile(key)
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if err != nil {
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return -1, err
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}
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err = vcm.localChunkManager.Write(key, bytes)
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if err != nil {
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return -1, err
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}
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return vcm.localChunkManager.ReadAt(key, p, off)
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}
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bytes, err := vcm.downloadVectorFile(key)
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if err != nil {
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return -1, err
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}
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if bytes == nil {
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return 0, errors.New("vectorChunkManager: data downloaded is nil")
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}
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if off < 0 || int64(len(bytes)) < off {
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return 0, errors.New("vectorChunkManager: invalid offset")
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}
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n := copy(p, bytes[off:])
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if n < len(p) {
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return n, io.EOF
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}
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return n, nil
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}
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