mirror of
https://github.com/seaweedfs/seaweedfs.git
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314 lines
7.6 KiB
Go
314 lines
7.6 KiB
Go
//go:build rocksdb
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// +build rocksdb
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package rocksdb
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import (
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"bytes"
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"context"
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"crypto/md5"
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"fmt"
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"io"
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"os"
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gorocksdb "github.com/linxGnu/grocksdb"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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weed_util "github.com/seaweedfs/seaweedfs/weed/util"
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)
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func init() {
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filer.Stores = append(filer.Stores, &RocksDBStore{})
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}
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type options struct {
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opt *gorocksdb.Options
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bto *gorocksdb.BlockBasedTableOptions
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ro *gorocksdb.ReadOptions
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wo *gorocksdb.WriteOptions
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}
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func (opt *options) init() {
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opt.opt = gorocksdb.NewDefaultOptions()
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opt.bto = gorocksdb.NewDefaultBlockBasedTableOptions()
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opt.ro = gorocksdb.NewDefaultReadOptions()
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opt.wo = gorocksdb.NewDefaultWriteOptions()
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}
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func (opt *options) close() {
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opt.opt.Destroy()
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opt.bto.Destroy()
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opt.ro.Destroy()
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opt.wo.Destroy()
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}
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type RocksDBStore struct {
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path string
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db *gorocksdb.DB
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options
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}
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func (store *RocksDBStore) GetName() string {
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return "rocksdb"
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}
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func (store *RocksDBStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
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dir := configuration.GetString(prefix + "dir")
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return store.initialize(dir)
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}
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func (store *RocksDBStore) initialize(dir string) (err error) {
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glog.Infof("filer store rocksdb dir: %s", dir)
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os.MkdirAll(dir, 0755)
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if err := weed_util.TestFolderWritable(dir); err != nil {
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return fmt.Errorf("Check Level Folder %s Writable: %s", dir, err)
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}
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store.options.init()
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store.opt.SetCreateIfMissing(true)
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// reduce write amplification
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// also avoid expired data stored in highest level never get compacted
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store.opt.SetLevelCompactionDynamicLevelBytes(true)
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store.opt.SetCompactionFilter(NewTTLFilter())
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// store.opt.SetMaxBackgroundCompactions(2)
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// https://github.com/tecbot/gorocksdb/issues/132
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store.bto.SetFilterPolicy(gorocksdb.NewBloomFilterFull(8))
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store.opt.SetBlockBasedTableFactory(store.bto)
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// store.opt.EnableStatistics()
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store.db, err = gorocksdb.OpenDb(store.opt, dir)
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return
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}
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func (store *RocksDBStore) BeginTransaction(ctx context.Context) (context.Context, error) {
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return ctx, nil
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}
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func (store *RocksDBStore) CommitTransaction(ctx context.Context) error {
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return nil
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}
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func (store *RocksDBStore) RollbackTransaction(ctx context.Context) error {
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return nil
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}
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func (store *RocksDBStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
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dir, name := entry.DirAndName()
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key := genKey(dir, name)
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value, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
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}
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err = store.db.Put(store.wo, key, value)
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if err != nil {
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return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
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}
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// println("saved", entry.FullPath, "chunks", len(entry.GetChunks()))
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return nil
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}
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func (store *RocksDBStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
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return store.InsertEntry(ctx, entry)
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}
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func (store *RocksDBStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
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dir, name := fullpath.DirAndName()
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key := genKey(dir, name)
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data, err := store.db.Get(store.ro, key)
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if data == nil || !data.Exists() {
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return nil, filer_pb.ErrNotFound
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}
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defer data.Free()
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if err != nil {
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return nil, fmt.Errorf("get %s : %v", fullpath, err)
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}
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entry = &filer.Entry{
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FullPath: fullpath,
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}
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err = entry.DecodeAttributesAndChunks(data.Data())
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if err != nil {
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return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
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}
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// println("read", entry.FullPath, "chunks", len(entry.GetChunks()), "data", len(data), string(data))
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return entry, nil
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}
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func (store *RocksDBStore) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
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dir, name := fullpath.DirAndName()
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key := genKey(dir, name)
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err = store.db.Delete(store.wo, key)
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if err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
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}
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return nil
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}
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func (store *RocksDBStore) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
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directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
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batch := gorocksdb.NewWriteBatch()
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defer batch.Destroy()
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ro := gorocksdb.NewDefaultReadOptions()
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defer ro.Destroy()
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ro.SetFillCache(false)
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iter := store.db.NewIterator(ro)
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defer iter.Close()
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err = enumerate(iter, directoryPrefix, nil, false, -1, func(key, value []byte) bool {
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batch.Delete(key)
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return true
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})
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if err != nil {
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return fmt.Errorf("delete list %s : %v", fullpath, err)
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}
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err = store.db.Write(store.wo, batch)
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if err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
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}
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return nil
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}
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func enumerate(iter *gorocksdb.Iterator, prefix, lastKey []byte, includeLastKey bool, limit int64, fn func(key, value []byte) bool) (err error) {
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if len(lastKey) == 0 {
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iter.Seek(prefix)
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} else {
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iter.Seek(lastKey)
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if !includeLastKey {
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if iter.Valid() {
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if bytes.Equal(iter.Key().Data(), lastKey) {
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iter.Next()
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}
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}
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}
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}
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i := int64(0)
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for ; iter.Valid(); iter.Next() {
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if limit > 0 {
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i++
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if i > limit {
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break
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}
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}
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key := iter.Key().Data()
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if !bytes.HasPrefix(key, prefix) {
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break
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}
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ret := fn(key, iter.Value().Data())
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if !ret {
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break
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}
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}
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if err := iter.Err(); err != nil {
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return fmt.Errorf("prefix scan iterator: %v", err)
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}
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return nil
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}
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func (store *RocksDBStore) ListDirectoryEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", eachEntryFunc)
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}
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func (store *RocksDBStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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directoryPrefix := genDirectoryKeyPrefix(dirPath, prefix)
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lastFileStart := directoryPrefix
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if startFileName != "" {
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lastFileStart = genDirectoryKeyPrefix(dirPath, startFileName)
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}
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ro := gorocksdb.NewDefaultReadOptions()
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defer ro.Destroy()
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ro.SetFillCache(false)
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iter := store.db.NewIterator(ro)
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defer iter.Close()
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err = enumerate(iter, directoryPrefix, lastFileStart, includeStartFile, limit, func(key, value []byte) bool {
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fileName := getNameFromKey(key)
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if fileName == "" {
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return true
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}
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entry := &filer.Entry{
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FullPath: weed_util.NewFullPath(string(dirPath), fileName),
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}
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lastFileName = fileName
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// println("list", entry.FullPath, "chunks", len(entry.GetChunks()))
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if decodeErr := entry.DecodeAttributesAndChunks(value); decodeErr != nil {
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err = decodeErr
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glog.V(0).Infof("list %s : %v", entry.FullPath, err)
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return false
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}
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if !eachEntryFunc(entry) {
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return false
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}
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return true
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})
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if err != nil {
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return lastFileName, fmt.Errorf("prefix list %s : %v", dirPath, err)
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}
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return lastFileName, err
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}
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func genKey(dirPath, fileName string) (key []byte) {
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key = hashToBytes(dirPath)
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key = append(key, []byte(fileName)...)
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return key
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}
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func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) {
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keyPrefix = hashToBytes(string(fullpath))
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if len(startFileName) > 0 {
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keyPrefix = append(keyPrefix, []byte(startFileName)...)
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}
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return keyPrefix
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}
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func getNameFromKey(key []byte) string {
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return string(key[md5.Size:])
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}
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// hash directory, and use last byte for partitioning
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func hashToBytes(dir string) []byte {
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h := md5.New()
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io.WriteString(h, dir)
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b := h.Sum(nil)
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return b
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}
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func (store *RocksDBStore) Shutdown() {
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store.db.Close()
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store.options.close()
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}
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