postgres3 filer

docker/compose/local-s3tests-compose.yml

@@ -1,6 +1,16 @@
 version: '3.9'
 
 services:
+  postgres:
+    image: postgres:13
+    environment:
+      - POSTGRES_DB=seaweedfs
+      - POSTGRES_USER=seaweedfs
+      - POSTGRES_PASSWORD=seaweedfs
+    ports:
+      - "5432:5432"
+    #command: ["postgres", "-c", "log_statement=all"]
+    command: ["postgres"]
   master:
     image: chrislusf/seaweedfs:local
     ports:

docker/filer.toml

@@ -1,3 +1,3 @@
-[leveldb2]
+[leveldb3]
 enabled = true
-dir = "/data/filerldb2"
+dir = "/data/filer_leveldb3"

docker/filer_leveldb3.toml

@@ -0,0 +1,3 @@
+[leveldb3]
+enabled = true
+dir = "/data/filer_leveldb3"

docker/filer_postgres2.toml

@@ -0,0 +1,21 @@
+[postgres2]
+enabled = true
+port = 5432
+createTable = """
+  CREATE TABLE IF NOT EXISTS "%s" (
+    dirhash   BIGINT,
+    name      VARCHAR(65535),
+    directory VARCHAR(65535),
+    meta      bytea,
+    PRIMARY KEY (dirhash, name)
+  );
+"""
+hostname = "postgres"
+username = "seaweedfs"
+database = "seaweedfs"          # create or use an existing database
+password = "seaweedfs"
+schema = ""
+sslmode = "disable"
+connection_max_idle = 5
+connection_max_open = 10
+connection_max_lifetime_seconds = 0

docker/filer_postgres3.toml

@@ -0,0 +1,12 @@
+[postgres3]
+enabled = true
+port = 5432
+hostname = "postgres"
+username = "seaweedfs"
+database = "seaweedfs"          # create or use an existing database
+password = "seaweedfs"
+schema = ""
+sslmode = "disable"
+connection_max_idle = 5
+connection_max_open = 10
+connection_max_lifetime_seconds = 0

weed/filer/postgres3/README.md

@@ -0,0 +1,33 @@
+# postgres3
+
+The `postgres3` filer implementation uses postgres-specific features and data structures to improve upon previous SQL implementations based on the `abstract_sql` module. 
+
+Of note, the `postgres2` filer implementation may leak directory hierarchy metadata when frequent inserts and deletes are
+performed using the S3 API. If an application workload pattern creates directories, populates them temporarily, and then
+deletes all objects in the directory, the `postgres2` filer implementation will continue to indefinitely maintain
+information about the orphaned directories. While these directories will not be shown in S3 API list requests, the metadata
+remains and places the burden of an unbounded number of unused rows on postgres.
+
+Seaweedfs provides the `-s3.allowEmptyFolder=false` CLI argument to automatically clean up orphaned directory entries, but
+this process necessarily races under high load and can cause unpredictable filer and postgres behavior.
+
+To solve this problem, `postgres3` does the following:
+
+1. One row in postgres _fully_ represents one object and its metadata
+2. Insert, update, get, and delete operate on a single row
+3. An array is stored of possible prefixes for each key
+4. List requests leverage the prefixes to dynamically assemble directory entries using a complex `SELECT` statement
+
+In order to efficiently query directory entries during list requests, `postgres3` uses special features of
+postgres:
+
+* An int64 array field called `prefixes` with a hash of each prefix found for a specific key
+* GIN indexing that provides fast set membership information on array fields
+* Special functions `split_part` (text parsing) and `cardinality` (length of the array field)
+
+`postgres3` uses automatic upsert capability with `ON CONFLICT ... UPDATE` so that insert and update are the same
+race-free operation.
+
+In the filer metadata tables, all objects start with `/`, causing prefix calculation to include the empty string (`""`).
+For space and index optimization, `postgres3` does not store the root prefix in the `prefixes` array, and instead
+relies on the condition `cardinality(prefixes) < 1` to discover objects at the root directory.

weed/filer/postgres3/postgres3_kvstore.go

@@ -0,0 +1,83 @@
+package postgres3
+
+/*
+ * Copyright 2022 Splunk Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"path"
+
+	"github.com/lib/pq"
+	"github.com/seaweedfs/seaweedfs/weed/filer"
+	"github.com/seaweedfs/seaweedfs/weed/filer/abstract_sql"
+)
+
+func (store *Postgres3Store) KvPut(ctx context.Context, key []byte, value []byte) error {
+	db, _, _, err := store.getTxOrDB(ctx, "", false)
+	if err != nil {
+		return fmt.Errorf("findDB: %v", err)
+	}
+
+	prefixes := calculatePrefixes(string(key))
+	hashedPrefixes := hashPrefixArray(prefixes)
+	_, err = db.ExecContext(ctx, fmt.Sprintf(insertEntryPattern, abstract_sql.DEFAULT_TABLE), key, path.Base(string(key)), pq.Array(hashedPrefixes), value)
+	if err != nil {
+		return fmt.Errorf("kv put: %v", err)
+	}
+	return nil
+}
+
+func (store *Postgres3Store) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
+	db, _, _, err := store.getTxOrDB(ctx, "", false)
+	if err != nil {
+		return nil, fmt.Errorf("findDB: %v", err)
+	}
+
+	row := db.QueryRowContext(ctx, fmt.Sprintf(findEntryPattern, abstract_sql.DEFAULT_TABLE), key)
+
+	err = row.Scan(&value)
+
+	if err == sql.ErrNoRows {
+		return nil, filer.ErrKvNotFound
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("kv get: %v", err)
+	}
+
+	return
+}
+
+func (store *Postgres3Store) KvDelete(ctx context.Context, key []byte) error {
+	db, _, _, err := store.getTxOrDB(ctx, "", false)
+	if err != nil {
+		return fmt.Errorf("findDB: %v", err)
+	}
+
+	res, err := db.ExecContext(ctx, fmt.Sprintf(deleteEntryPattern, abstract_sql.DEFAULT_TABLE), key)
+	if err != nil {
+		return fmt.Errorf("kv delete: %s", err)
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("kv delete no rows affected: %s", err)
+	}
+
+	return nil
+}

weed/filer/postgres3/postgres3_store.go

@@ -0,0 +1,512 @@
+package postgres3
+
+/*
+ * Copyright 2022 Splunk Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"os"
+	"path"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/lib/pq"
+	_ "github.com/lib/pq"
+	"github.com/seaweedfs/seaweedfs/weed/filer"
+	"github.com/seaweedfs/seaweedfs/weed/filer/abstract_sql"
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
+	"github.com/seaweedfs/seaweedfs/weed/util"
+)
+
+const (
+	CONNECTION_URL_PATTERN = "host=%s port=%d sslmode=%s connect_timeout=30"
+
+	createTablePattern = `CREATE TABLE IF NOT EXISTS "%s" (
+		key       varchar(65535) PRIMARY KEY,
+		name      varchar(65535),
+		prefixes  bigint[],
+		meta      bytea
+	)`
+	createTableIndexPattern = `CREATE INDEX on "%s" USING gin (prefixes);`
+	deleteTablePattern      = `DROP TABLE "%s";`
+	insertEntryPattern      = `INSERT INTO "%s" (key, name, prefixes, meta) VALUES ($1, $2, $3, $4)
+	ON CONFLICT (key)
+	DO
+	  UPDATE SET meta = EXCLUDED.meta;`
+	findEntryPattern      = `SELECT meta FROM "%s" WHERE key = $1`
+	deleteEntryPattern    = `DELETE FROM "%s" WHERE key = $1`
+	listEntryQueryPattern = `SELECT key, name, isdir, meta FROM
+	(
+		SELECT key, name, false as isdir, meta FROM "%s"
+		WHERE prefixes @> $1 AND cardinality(prefixes) < $2 - 1
+		AND name __COMPARISON__ $3 AND name LIKE $4 ORDER BY key ASC LIMIT $6
+	) s1
+	UNION
+	(
+		SELECT dir, dir, true isdir, NULL::bytea meta FROM
+		(
+			SELECT DISTINCT split_part(key, '/', $2) AS dir FROM "%s"
+			WHERE prefixes @> $1 AND cardinality(prefixes) > $5 - 1 ORDER BY dir ASC
+		) t1
+		WHERE t1.dir > $3 AND t1.dir LIKE $4 ORDER BY dir ASC
+	)
+	ORDER BY name ASC LIMIT $6`
+	deleteFolderChildrenPattern = `DELETE FROM "%s" WHERE prefixes @> $1 and key like $2`
+)
+
+var (
+	listEntryExclusivePattern string
+	listEntryInclusivePattern string
+)
+
+var _ filer.BucketAware = (*Postgres3Store)(nil)
+
+func init() {
+	filer.Stores = append(filer.Stores, &Postgres3Store{})
+
+	listEntryExclusivePattern = strings.ReplaceAll(listEntryQueryPattern, "__COMPARISON__", ">")
+	listEntryInclusivePattern = strings.ReplaceAll(listEntryQueryPattern, "__COMPARISON__", ">=")
+}
+
+type Postgres3Store struct {
+	DB                 *sql.DB
+	SupportBucketTable bool
+	dbs                map[string]bool
+	dbsLock            sync.Mutex
+}
+
+func (store *Postgres3Store) GetName() string {
+	return "postgres3"
+}
+
+func (store *Postgres3Store) Initialize(configuration util.Configuration, prefix string) error {
+	return store.initialize(
+		configuration.GetString(prefix+"createTable"),
+		configuration.GetString(prefix+"username"),
+		configuration.GetString(prefix+"password"),
+		configuration.GetString(prefix+"hostname"),
+		configuration.GetInt(prefix+"port"),
+		configuration.GetString(prefix+"database"),
+		configuration.GetString(prefix+"schema"),
+		configuration.GetString(prefix+"sslmode"),
+		configuration.GetInt(prefix+"connection_max_idle"),
+		configuration.GetInt(prefix+"connection_max_open"),
+		configuration.GetInt(prefix+"connection_max_lifetime_seconds"),
+	)
+}
+
+func (store *Postgres3Store) initialize(createTable, user, password, hostname string, port int, database, schema, sslmode string, maxIdle, maxOpen, maxLifetimeSeconds int) (err error) {
+	store.SupportBucketTable = true
+	sqlUrl := fmt.Sprintf(CONNECTION_URL_PATTERN, hostname, port, sslmode)
+	if user != "" {
+		sqlUrl += " user=" + user
+	}
+	adaptedSqlUrl := sqlUrl
+	if password != "" {
+		sqlUrl += " password=" + password
+		adaptedSqlUrl += " password=ADAPTED"
+	}
+	if database != "" {
+		sqlUrl += " dbname=" + database
+		adaptedSqlUrl += " dbname=" + database
+	}
+	if schema != "" {
+		sqlUrl += " search_path=" + schema
+		adaptedSqlUrl += " search_path=" + schema
+	}
+	var dbErr error
+	store.DB, dbErr = sql.Open("postgres", sqlUrl)
+	if dbErr != nil {
+		store.DB.Close()
+		store.DB = nil
+		return fmt.Errorf("can not connect to %s error:%v", adaptedSqlUrl, err)
+	}
+
+	store.DB.SetMaxIdleConns(maxIdle)
+	store.DB.SetMaxOpenConns(maxOpen)
+	store.DB.SetConnMaxLifetime(time.Duration(maxLifetimeSeconds) * time.Second)
+
+	if err = store.DB.Ping(); err != nil {
+		return fmt.Errorf("connect to %s error:%v", sqlUrl, err)
+	}
+
+	if err = store.CreateTable(context.Background(), abstract_sql.DEFAULT_TABLE); err != nil {
+		return fmt.Errorf("init table %s: %v", abstract_sql.DEFAULT_TABLE, err)
+	}
+
+	return nil
+}
+
+func (store *Postgres3Store) CanDropWholeBucket() bool {
+	return store.SupportBucketTable
+}
+
+func (store *Postgres3Store) OnBucketCreation(bucket string) {
+	store.dbsLock.Lock()
+	defer store.dbsLock.Unlock()
+
+	store.CreateTable(context.Background(), bucket)
+
+	if store.dbs == nil {
+		return
+	}
+	store.dbs[bucket] = true
+}
+
+func (store *Postgres3Store) OnBucketDeletion(bucket string) {
+	store.dbsLock.Lock()
+	defer store.dbsLock.Unlock()
+
+	store.deleteTable(context.Background(), bucket)
+
+	if store.dbs == nil {
+		return
+	}
+	delete(store.dbs, bucket)
+}
+
+func (store *Postgres3Store) getTxOrDB(ctx context.Context, fullpath util.FullPath, isForChildren bool) (txOrDB abstract_sql.TxOrDB, bucket string, shortPath util.FullPath, err error) {
+
+	shortPath = fullpath
+	bucket = abstract_sql.DEFAULT_TABLE
+
+	if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
+		txOrDB = tx
+	} else {
+		txOrDB = store.DB
+	}
+
+	if !store.SupportBucketTable {
+		return
+	}
+
+	if !strings.HasPrefix(string(fullpath), "/buckets/") {
+		return
+	}
+
+	// detect bucket
+	bucketAndObjectKey := string(fullpath)[len("/buckets/"):]
+	t := strings.Index(bucketAndObjectKey, "/")
+	if t < 0 && !isForChildren {
+		return
+	}
+	bucket = bucketAndObjectKey
+	shortPath = "/"
+	if t > 0 {
+		bucket = bucketAndObjectKey[:t]
+		shortPath = util.FullPath(bucketAndObjectKey[t:])
+	}
+
+	if isValidBucket(bucket) {
+		store.dbsLock.Lock()
+		defer store.dbsLock.Unlock()
+
+		if store.dbs == nil {
+			store.dbs = make(map[string]bool)
+		}
+
+		if _, found := store.dbs[bucket]; !found {
+			if err = store.CreateTable(ctx, bucket); err == nil {
+				store.dbs[bucket] = true
+			}
+		}
+
+	}
+
+	return
+}
+
+func (store *Postgres3Store) InsertEntry(ctx context.Context, entry *filer.Entry) error {
+	db, bucket, shortPath, err := store.getTxOrDB(ctx, entry.FullPath, false)
+	if err != nil {
+		return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
+	}
+
+	if entry.IsDirectory() {
+		if isValidBucket(bucket) && !strings.HasPrefix(string(shortPath), "/.uploads") {
+			// Ignore directory creations, but not bucket creations or multipart uploads
+			return nil
+		}
+	}
+
+	meta, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
+	}
+
+	if len(entry.Chunks) > 50 {
+		meta = util.MaybeGzipData(meta)
+	}
+
+	prefixes := calculatePrefixes(string(shortPath))
+	hashedPrefixes := hashPrefixArray(prefixes)
+	_, err = db.ExecContext(ctx, fmt.Sprintf(insertEntryPattern, bucket), shortPath, path.Base(string(shortPath)), pq.Array(hashedPrefixes), meta)
+	if err != nil {
+		return fmt.Errorf("insert/upsert %s: %s", entry.FullPath, err)
+	}
+	return nil
+}
+
+func (store *Postgres3Store) UpdateEntry(ctx context.Context, entry *filer.Entry) error {
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *Postgres3Store) FindEntry(ctx context.Context, fullpath util.FullPath) (*filer.Entry, error) {
+
+	db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false)
+	if err != nil {
+		return nil, fmt.Errorf("findDB %s : %v", fullpath, err)
+	}
+
+	row := db.QueryRowContext(ctx, fmt.Sprintf(findEntryPattern, bucket), shortPath)
+
+	var data []byte
+	if err := row.Scan(&data); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, filer_pb.ErrNotFound
+		}
+		return nil, fmt.Errorf("find %s: %v", fullpath, err)
+	}
+
+	entry := &filer.Entry{
+		FullPath: fullpath,
+	}
+	if err := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
+		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
+	}
+
+	return entry, nil
+}
+
+func (store *Postgres3Store) DeleteEntry(ctx context.Context, fullpath util.FullPath) error {
+	db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false)
+	if err != nil {
+		return fmt.Errorf("findDB %s : %v", fullpath, err)
+	}
+
+	res, err := db.ExecContext(ctx, fmt.Sprintf(deleteEntryPattern, bucket), shortPath)
+	if err != nil {
+		return fmt.Errorf("delete %s: %s", fullpath, err)
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("delete %s but no rows affected: %s", fullpath, err)
+	}
+
+	return nil
+}
+
+func (store *Postgres3Store) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) (err error) {
+	db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, true)
+	if err != nil {
+		return fmt.Errorf("findDB %s : %v", fullpath, err)
+	}
+
+	if isValidBucket(bucket) && shortPath == "/" {
+		if err = store.deleteTable(ctx, bucket); err == nil {
+			store.dbsLock.Lock()
+			delete(store.dbs, bucket)
+			store.dbsLock.Unlock()
+			return nil
+		} else {
+			return err
+		}
+	}
+
+	sqlText := fmt.Sprintf(deleteFolderChildrenPattern, bucket)
+	prefixes := calculatePrefixes(string(shortPath))
+	hashedPrefixes := hashPrefixArray(prefixes)
+	glog.V(4).Infof("delete %s SQL %s %d", string(shortPath), sqlText, hashedPrefixes)
+	res, err := db.ExecContext(ctx, sqlText, pq.Array(hashedPrefixes), string(shortPath)+"/%")
+	if err != nil {
+		return fmt.Errorf("deleteFolderChildren %s: %s", fullpath, err)
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("deleteFolderChildren %s but no rows affected: %s", fullpath, err)
+	}
+	return nil
+}
+
+func (store *Postgres3Store) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+	return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", nil)
+}
+
+func (store *Postgres3Store) ListDirectoryPrefixedEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+	db, bucket, shortPath, err := store.getTxOrDB(ctx, dirPath, true)
+	if err != nil {
+		return lastFileName, fmt.Errorf("findDB %s : %v", dirPath, err)
+	}
+
+	slashedShortPath := appendSlash(string(shortPath))
+	shortPathParts := len(strings.Split(slashedShortPath, "/"))
+
+	sqlText := fmt.Sprintf(listEntryExclusivePattern, bucket, bucket)
+	if includeStartFile {
+		sqlText = fmt.Sprintf(listEntryInclusivePattern, bucket, bucket)
+	}
+
+	prefixes := calculatePrefixes(string(slashedShortPath))
+	hashedPrefixes := hashPrefixArray(prefixes)
+
+	rows, err := db.QueryContext(ctx, sqlText,
+		pq.Array(hashedPrefixes),
+		shortPathParts,
+		startFileName,
+		prefix+"%",
+		shortPathParts-1,
+		limit+1)
+
+	if err != nil {
+		return lastFileName, fmt.Errorf("list %s : %v", dirPath, err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var key string
+		var name string
+		var isDir bool
+		var data []byte
+		if err = rows.Scan(&key, &name, &isDir, &data); err != nil {
+			glog.V(0).Infof("scan %s : %v", dirPath, err)
+			return lastFileName, fmt.Errorf("scan %s: %v", dirPath, err)
+		}
+
+		if !isDir {
+			lastFileName = name
+
+			entry := &filer.Entry{
+				FullPath: util.NewFullPath(string(dirPath), name),
+			}
+
+			if err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
+				glog.V(0).Infof("scan decode %s : %v", entry.FullPath, err)
+				return lastFileName, fmt.Errorf("scan decode %s : %v", entry.FullPath, err)
+			}
+
+			if !eachEntryFunc(entry) {
+				break
+			}
+		} else {
+			lastFileName = key
+			dirName := key
+			entry := &filer.Entry{
+				FullPath: util.NewFullPath(string(dirPath), dirName),
+			}
+
+			entry.Attr.Mode |= os.ModeDir | 0775
+			if !eachEntryFunc(entry) {
+				break
+			}
+		}
+	}
+
+	return lastFileName, nil
+}
+
+func (store *Postgres3Store) BeginTransaction(ctx context.Context) (context.Context, error) {
+	tx, err := store.DB.BeginTx(ctx, &sql.TxOptions{
+		Isolation: sql.LevelReadCommitted,
+		ReadOnly:  false,
+	})
+	if err != nil {
+		return ctx, err
+	}
+
+	return context.WithValue(ctx, "tx", tx), nil
+}
+
+func (store *Postgres3Store) CommitTransaction(ctx context.Context) error {
+	if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
+		return tx.Commit()
+	}
+	return nil
+}
+
+func (store *Postgres3Store) RollbackTransaction(ctx context.Context) error {
+	if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
+		return tx.Rollback()
+	}
+	return nil
+}
+
+func (store *Postgres3Store) Shutdown() {
+	store.DB.Close()
+}
+
+func (store *Postgres3Store) CreateTable(ctx context.Context, bucket string) error {
+	_, err := store.DB.ExecContext(ctx, fmt.Sprintf(createTablePattern, bucket))
+	if err != nil {
+		return fmt.Errorf("create bucket table: %v", err)
+	}
+
+	_, err = store.DB.ExecContext(ctx, fmt.Sprintf(createTableIndexPattern, bucket))
+	if err != nil {
+		return fmt.Errorf("create bucket index: %v", err)
+	}
+	return err
+}
+
+func (store *Postgres3Store) deleteTable(ctx context.Context, bucket string) error {
+	if !store.SupportBucketTable {
+		return nil
+	}
+	_, err := store.DB.ExecContext(ctx, fmt.Sprintf(deleteTablePattern, bucket))
+	return err
+}
+
+func isValidBucket(bucket string) bool {
+	return bucket != abstract_sql.DEFAULT_TABLE && bucket != ""
+}
+
+// calculatePrefixes returns the prefixes for a given path. The root prefix "/" is ignored to
+// save space in the returned array
+func calculatePrefixes(fullPath string) []string {
+	res := strings.Split(fullPath, "/")
+	maxPrefixes := len(res)
+
+	var retval []string
+	for i := 1; i < maxPrefixes; i++ {
+		calculatedPrefix := strings.Join(res[0:i], "/") + "/"
+		if calculatedPrefix == "/" {
+			continue
+		}
+		retval = append(retval, calculatedPrefix)
+	}
+	return retval
+}
+
+// hashPrefixArray converts input prefix array into int64 hashes
+func hashPrefixArray(a []string) []int64 {
+	hashed := make([]int64, len(a))
+	for i := range a {
+		hashed[i] = util.HashStringToLong(a[i])
+	}
+	return hashed
+}
+
+func appendSlash(s string) string {
+	if !strings.HasSuffix(s, "/") {
+		return s + "/"
+	}
+	return s
+}

weed/filer/postgres3/postgres3_store_test.go

@@ -0,0 +1,41 @@
+package postgres3
+
+/*
+ * Copyright 2022 Splunk Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCalculatePrefixes(t *testing.T) {
+	assert := assert.New(t)
+	var path string
+	var prefixes []string
+
+	path = "/test1"
+	prefixes = calculatePrefixes(path)
+	assert.Equal(prefixes, []string(nil))
+
+	path = "/test1/test2"
+	prefixes = calculatePrefixes(path)
+	assert.Equal(prefixes, []string{"/test1/"})
+
+	path = "/test1/test2/test3"
+	prefixes = calculatePrefixes(path)
+	assert.Equal(prefixes, []string{"/test1/", "/test1/test2/"})
+}

weed/server/filer_server.go

@@ -34,6 +34,7 @@ import (
 	_ "github.com/seaweedfs/seaweedfs/weed/filer/mysql2"
 	_ "github.com/seaweedfs/seaweedfs/weed/filer/postgres"
 	_ "github.com/seaweedfs/seaweedfs/weed/filer/postgres2"
+	_ "github.com/seaweedfs/seaweedfs/weed/filer/postgres3"
 	_ "github.com/seaweedfs/seaweedfs/weed/filer/redis"
 	_ "github.com/seaweedfs/seaweedfs/weed/filer/redis2"
 	_ "github.com/seaweedfs/seaweedfs/weed/filer/redis3"

weed/server/filer_server_handlers_tagging.go

@@ -89,7 +89,7 @@ func (fs *FilerServer) DeleteTaggingHandler(w http.ResponseWriter, r *http.Reque
 
 	// delete all tags or specific tags
 	hasDeletion := false
-	for header, _ := range existingEntry.Extended {
+	for header := range existingEntry.Extended {
 		if strings.HasPrefix(header, needle.PairNamePrefix) {
 			if len(deletions) == 0 {
 				delete(existingEntry.Extended, header)