add cassandra2 (#6582)
This commit is contained in:
Chris Lu
221
weed/filer/cassandra2/cassandra_store.go
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221
weed/filer/cassandra2/cassandra_store.go
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@@ -0,0 +1,221 @@
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package cassandra2
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import (
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"context"
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"errors"
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"fmt"
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"github.com/gocql/gocql"
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"time"
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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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"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, &Cassandra2Store{})
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}
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type Cassandra2Store struct {
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cluster *gocql.ClusterConfig
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session *gocql.Session
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superLargeDirectoryHash map[string]string
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}
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func (store *Cassandra2Store) GetName() string {
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return "cassandra2"
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}
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func (store *Cassandra2Store) Initialize(configuration util.Configuration, prefix string) (err error) {
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return store.initialize(
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configuration.GetString(prefix+"keyspace"),
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configuration.GetStringSlice(prefix+"hosts"),
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configuration.GetString(prefix+"username"),
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configuration.GetString(prefix+"password"),
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configuration.GetStringSlice(prefix+"superLargeDirectories"),
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configuration.GetString(prefix+"localDC"),
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configuration.GetInt(prefix+"connection_timeout_millisecond"),
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)
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}
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func (store *Cassandra2Store) isSuperLargeDirectory(dir string) (dirHash string, isSuperLargeDirectory bool) {
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dirHash, isSuperLargeDirectory = store.superLargeDirectoryHash[dir]
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return
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}
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func (store *Cassandra2Store) initialize(keyspace string, hosts []string, username string, password string, superLargeDirectories []string, localDC string, timeout int) (err error) {
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store.cluster = gocql.NewCluster(hosts...)
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if username != "" && password != "" {
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store.cluster.Authenticator = gocql.PasswordAuthenticator{Username: username, Password: password}
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}
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store.cluster.Keyspace = keyspace
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store.cluster.Timeout = time.Duration(timeout) * time.Millisecond
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glog.V(0).Infof("timeout = %d", timeout)
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fallback := gocql.RoundRobinHostPolicy()
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if localDC != "" {
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fallback = gocql.DCAwareRoundRobinPolicy(localDC)
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}
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store.cluster.PoolConfig.HostSelectionPolicy = gocql.TokenAwareHostPolicy(fallback)
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store.cluster.Consistency = gocql.LocalQuorum
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store.session, err = store.cluster.CreateSession()
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if err != nil {
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glog.V(0).Infof("Failed to open cassandra2 store, hosts %v, keyspace %s", hosts, keyspace)
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}
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// set directory hash
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store.superLargeDirectoryHash = make(map[string]string)
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existingHash := make(map[string]string)
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for _, dir := range superLargeDirectories {
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// adding dir hash to avoid duplicated names
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dirHash := util.Md5String([]byte(dir))[:4]
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store.superLargeDirectoryHash[dir] = dirHash
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if existingDir, found := existingHash[dirHash]; found {
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glog.Fatalf("directory %s has the same hash as %s", dir, existingDir)
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}
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existingHash[dirHash] = dir
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}
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return
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}
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func (store *Cassandra2Store) BeginTransaction(ctx context.Context) (context.Context, error) {
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return ctx, nil
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}
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func (store *Cassandra2Store) CommitTransaction(ctx context.Context) error {
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return nil
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}
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func (store *Cassandra2Store) RollbackTransaction(ctx context.Context) error {
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return nil
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}
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func (store *Cassandra2Store) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
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dir, name := entry.FullPath.DirAndName()
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if dirHash, ok := store.isSuperLargeDirectory(dir); ok {
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dir, name = dirHash+name, ""
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}
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meta, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encode %s: %s", entry.FullPath, err)
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}
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if len(entry.GetChunks()) > filer.CountEntryChunksForGzip {
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meta = util.MaybeGzipData(meta)
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}
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if err := store.session.Query(
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"INSERT INTO filemeta (dirhash,directory,name,meta) VALUES(?,?,?,?) USING TTL ? ",
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util.HashStringToLong(dir), dir, name, meta, entry.TtlSec).Exec(); err != nil {
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return fmt.Errorf("insert %s: %s", entry.FullPath, err)
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}
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return nil
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}
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func (store *Cassandra2Store) 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 *Cassandra2Store) FindEntry(ctx context.Context, fullpath util.FullPath) (entry *filer.Entry, err error) {
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dir, name := fullpath.DirAndName()
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if dirHash, ok := store.isSuperLargeDirectory(dir); ok {
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dir, name = dirHash+name, ""
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}
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var data []byte
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if err := store.session.Query(
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"SELECT meta FROM filemeta WHERE dirhash=? AND directory=? AND name=?",
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util.HashStringToLong(dir), dir, name).Scan(&data); err != nil {
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if errors.Is(err, gocql.ErrNotFound) {
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return nil, filer_pb.ErrNotFound
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}
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return nil, 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(util.MaybeDecompressData(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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return entry, nil
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}
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func (store *Cassandra2Store) DeleteEntry(ctx context.Context, fullpath util.FullPath) error {
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dir, name := fullpath.DirAndName()
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if dirHash, ok := store.isSuperLargeDirectory(dir); ok {
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dir, name = dirHash+name, ""
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}
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if err := store.session.Query(
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"DELETE FROM filemeta WHERE dirhash=? AND directory=? AND name=?",
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util.HashStringToLong(dir), dir, name).Exec(); 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 *Cassandra2Store) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) error {
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if _, ok := store.isSuperLargeDirectory(string(fullpath)); ok {
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return nil // filer.ErrUnsupportedSuperLargeDirectoryListing
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}
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if err := store.session.Query(
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"DELETE FROM filemeta WHERE dirhash=? AND directory=?",
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util.HashStringToLong(string(fullpath)), fullpath).Exec(); 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 *Cassandra2Store) ListDirectoryPrefixedEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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return lastFileName, filer.ErrUnsupportedListDirectoryPrefixed
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}
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func (store *Cassandra2Store) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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if _, ok := store.isSuperLargeDirectory(string(dirPath)); ok {
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return // nil, filer.ErrUnsupportedSuperLargeDirectoryListing
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}
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cqlStr := "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND directory=? AND name>? ORDER BY NAME ASC LIMIT ?"
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if includeStartFile {
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cqlStr = "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND directory=? AND name>=? ORDER BY NAME ASC LIMIT ?"
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}
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var data []byte
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var name string
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iter := store.session.Query(cqlStr, util.HashStringToLong(string(dirPath)), string(dirPath), startFileName, limit+1).Iter()
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for iter.Scan(&name, &data) {
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entry := &filer.Entry{
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FullPath: util.NewFullPath(string(dirPath), name),
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}
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lastFileName = name
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if decodeErr := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); 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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break
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}
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if !eachEntryFunc(entry) {
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break
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}
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}
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if err = iter.Close(); err != nil {
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glog.V(0).Infof("list iterator close: %v", err)
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}
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return lastFileName, err
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}
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func (store *Cassandra2Store) Shutdown() {
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store.session.Close()
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}
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