mirror of
https://gitee.com/milvus-io/milvus.git
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335 lines
9.2 KiB
Go
335 lines
9.2 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "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
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package storage
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import (
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"context"
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"errors"
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"io"
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"sync"
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"time"
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"go.uber.org/zap"
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"golang.org/x/exp/mmap"
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"github.com/milvus-io/milvus/internal/common"
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"github.com/milvus-io/milvus/internal/log"
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"github.com/milvus-io/milvus/internal/proto/etcdpb"
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"github.com/milvus-io/milvus/internal/util/cache"
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)
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var (
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defaultLocalCacheSize = 64
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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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cacheStorage ChunkManager
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vectorStorage ChunkManager
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cache *cache.LRU[string, *mmap.ReaderAt]
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insertCodec *InsertCodec
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cacheEnable bool
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cacheLimit int64
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cacheSize int64
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cacheSizeMutex sync.Mutex
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fixSize bool // Prevent cache capactiy from changing too frequently
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}
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var _ ChunkManager = (*VectorChunkManager)(nil)
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// NewVectorChunkManager create a new vector manager object.
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func NewVectorChunkManager(ctx context.Context, cacheStorage ChunkManager, vectorStorage ChunkManager, schema *etcdpb.CollectionMeta, cacheLimit int64, cacheEnable bool) (*VectorChunkManager, error) {
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insertCodec := NewInsertCodec(schema)
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vcm := &VectorChunkManager{
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cacheStorage: cacheStorage,
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vectorStorage: vectorStorage,
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insertCodec: insertCodec,
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cacheEnable: cacheEnable,
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cacheLimit: cacheLimit,
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}
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if cacheEnable {
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if cacheLimit <= 0 {
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return nil, errors.New("cache limit must be positive if cacheEnable")
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}
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c, err := cache.NewLRU(defaultLocalCacheSize, func(k string, v *mmap.ReaderAt) {
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size := v.Len()
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err := v.Close()
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if err != nil {
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log.Error("Unmmap file failed", zap.Any("file", k))
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}
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err = cacheStorage.Remove(ctx, k)
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if err != nil {
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log.Error("cache storage remove file failed", zap.Any("file", k))
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}
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vcm.cacheSizeMutex.Lock()
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vcm.cacheSize -= int64(size)
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vcm.cacheSizeMutex.Unlock()
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})
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if err != nil {
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return nil, err
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}
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vcm.cache = c
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}
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return vcm, nil
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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) deserializeVectorFile(filePath string, content []byte) ([]byte, error) {
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blob := &Blob{
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Key: filePath,
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Value: content,
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}
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_, _, data, err := vcm.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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// Note: here we assume that only one field in the binlog.
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var results []byte
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for _, singleData := range data.Data {
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bs, err := FieldDataToBytes(common.Endian, singleData)
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if err == nil {
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results = bs
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}
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}
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return results, nil
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}
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// RootPath returns vector root path
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func (vcm *VectorChunkManager) RootPath() string {
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return vcm.vectorStorage.RootPath()
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}
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// Path 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) Path(ctx context.Context, filePath string) (string, error) {
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return vcm.vectorStorage.Path(ctx, filePath)
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}
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func (vcm *VectorChunkManager) Size(ctx context.Context, filePath string) (int64, error) {
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return vcm.vectorStorage.Size(ctx, filePath)
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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(ctx context.Context, filePath string, content []byte) error {
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return vcm.vectorStorage.Write(ctx, filePath, content)
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}
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// MultiWrite writes the vector data to local cache if cache enabled.
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func (vcm *VectorChunkManager) MultiWrite(ctx context.Context, contents map[string][]byte) error {
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return vcm.vectorStorage.MultiWrite(ctx, contents)
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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(ctx context.Context, filePath string) (bool, error) {
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return vcm.vectorStorage.Exist(ctx, filePath)
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}
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func (vcm *VectorChunkManager) readWithCache(ctx context.Context, filePath string) ([]byte, error) {
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contents, err := vcm.vectorStorage.Read(ctx, filePath)
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if err != nil {
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return nil, err
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}
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results, err := vcm.deserializeVectorFile(filePath, contents)
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if err != nil {
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return nil, err
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}
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err = vcm.cacheStorage.Write(ctx, filePath, results)
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if err != nil {
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return nil, err
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}
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r, err := vcm.cacheStorage.Mmap(ctx, filePath)
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if err != nil {
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return nil, err
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}
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size, err := vcm.cacheStorage.Size(ctx, filePath)
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if err != nil {
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return nil, err
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}
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vcm.cacheSizeMutex.Lock()
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vcm.cacheSize += size
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vcm.cacheSizeMutex.Unlock()
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if !vcm.fixSize {
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if vcm.cacheSize < vcm.cacheLimit {
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if vcm.cache.Len() == vcm.cache.Capacity() {
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newSize := float32(vcm.cache.Capacity()) * 1.25
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vcm.cache.Resize(int(newSize))
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}
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} else {
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// +1 is for add current value
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vcm.cache.Resize(vcm.cache.Len() + 1)
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vcm.fixSize = true
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}
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}
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vcm.cache.Add(filePath, r)
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return results, nil
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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(ctx context.Context, filePath string) ([]byte, error) {
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if vcm.cacheEnable {
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if r, ok := vcm.cache.Get(filePath); ok {
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p := make([]byte, r.Len())
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_, err := r.ReadAt(p, 0)
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if err != nil {
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return p, err
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}
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return p, nil
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}
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return vcm.readWithCache(ctx, filePath)
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}
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contents, err := vcm.vectorStorage.Read(ctx, filePath)
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if err != nil {
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return nil, err
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}
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return vcm.deserializeVectorFile(filePath, contents)
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}
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// MultiRead reads the pure vector data. If cached, it reads from local.
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func (vcm *VectorChunkManager) MultiRead(ctx context.Context, filePaths []string) ([][]byte, error) {
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results := make([][]byte, len(filePaths))
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for i, filePath := range filePaths {
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content, err := vcm.Read(ctx, filePath)
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if err != nil {
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return nil, err
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}
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results[i] = content
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}
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return results, nil
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}
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func (vcm *VectorChunkManager) ReadWithPrefix(ctx context.Context, prefix string) ([]string, [][]byte, error) {
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filePaths, _, err := vcm.ListWithPrefix(ctx, prefix, true)
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if err != nil {
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return nil, nil, err
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}
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results, err := vcm.MultiRead(ctx, filePaths)
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if err != nil {
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return nil, nil, err
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}
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return filePaths, results, nil
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}
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func (vcm *VectorChunkManager) ListWithPrefix(ctx context.Context, prefix string, recursive bool) ([]string, []time.Time, error) {
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return vcm.vectorStorage.ListWithPrefix(ctx, prefix, recursive)
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}
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func (vcm *VectorChunkManager) Mmap(ctx context.Context, filePath string) (*mmap.ReaderAt, error) {
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if vcm.cacheEnable && vcm.cache != nil {
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if r, ok := vcm.cache.Get(filePath); ok {
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return r, nil
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}
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}
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return nil, errors.New("the file mmap has not been cached")
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}
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func (vcm *VectorChunkManager) Reader(ctx context.Context, filePath string) (FileReader, error) {
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return nil, errors.New("this method has not been implemented")
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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(ctx context.Context, filePath string, off int64, length int64) ([]byte, error) {
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if vcm.cacheEnable {
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if r, ok := vcm.cache.Get(filePath); ok {
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p := make([]byte, length)
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_, err := r.ReadAt(p, off)
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if err != nil {
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return nil, err
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}
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return p, nil
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}
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results, err := vcm.readWithCache(ctx, filePath)
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if err != nil {
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return nil, err
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}
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return results[off : off+length], nil
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}
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contents, err := vcm.vectorStorage.Read(ctx, filePath)
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if err != nil {
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return nil, err
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}
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results, err := vcm.deserializeVectorFile(filePath, contents)
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if err != nil {
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return nil, err
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}
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if off < 0 || int64(len(results)) < off {
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return nil, errors.New("vectorChunkManager: invalid offset")
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}
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p := make([]byte, length)
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n := copy(p, results[off:])
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if n < len(p) {
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return nil, io.EOF
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}
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return p, nil
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}
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func (vcm *VectorChunkManager) Remove(ctx context.Context, filePath string) error {
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err := vcm.vectorStorage.Remove(ctx, filePath)
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if err != nil {
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return err
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}
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if vcm.cacheEnable {
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vcm.cache.Remove(filePath)
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}
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return nil
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}
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func (vcm *VectorChunkManager) MultiRemove(ctx context.Context, filePaths []string) error {
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err := vcm.vectorStorage.MultiRemove(ctx, filePaths)
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if err != nil {
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return err
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}
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if vcm.cacheEnable {
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for _, p := range filePaths {
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vcm.cache.Remove(p)
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}
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}
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return nil
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}
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func (vcm *VectorChunkManager) RemoveWithPrefix(ctx context.Context, prefix string) error {
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err := vcm.vectorStorage.RemoveWithPrefix(ctx, prefix)
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if err != nil {
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return err
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}
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if vcm.cacheEnable {
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filePaths, _, err := vcm.ListWithPrefix(ctx, prefix, true)
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if err != nil {
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return err
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}
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for _, p := range filePaths {
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vcm.cache.Remove(p)
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}
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}
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return nil
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}
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func (vcm *VectorChunkManager) Close() {
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if vcm.cache != nil && vcm.cacheEnable {
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vcm.cache.Close()
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}
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}
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