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