Added Pebble DB CLI util tool (#371)

The tools allows for debug / inspect / repair a Pebble DB.

cmd/main.go

@@ -23,6 +23,7 @@ import (
 	"oxia/cmd/client"
 	"oxia/cmd/coordinator"
 	"oxia/cmd/health"
+	"oxia/cmd/pebble"
 	"oxia/cmd/perf"
 	"oxia/cmd/server"
 	"oxia/cmd/standalone"
@@ -57,6 +58,7 @@ func init() {
 	rootCmd.AddCommand(perf.Cmd)
 	rootCmd.AddCommand(server.Cmd)
 	rootCmd.AddCommand(standalone.Cmd)
+	rootCmd.AddCommand(pebble.Cmd)
 }
 
 func configureLogLevel(cmd *cobra.Command, args []string) error {

cmd/pebble/cmd.go

@@ -0,0 +1,37 @@
+// Copyright 2023 StreamNative, 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.
+
+package pebble
+
+import (
+	"github.com/cockroachdb/pebble/tool"
+	"github.com/spf13/cobra"
+	"oxia/server/kv"
+)
+
+var (
+	Cmd = &cobra.Command{
+		Use:   "pebble",
+		Short: "Pebble DB utils",
+		Long:  `Tools for the Pebble DB`,
+	}
+)
+
+func init() {
+	t := tool.New(tool.DefaultComparer(kv.OxiaSlashSpanComparer))
+
+	for _, cmd := range t.Commands {
+		Cmd.AddCommand(cmd)
+	}
+}

server/kv/kv_pebble.go

@@ -32,6 +32,21 @@ import (
 	"time"
 )
 
+var (
+	OxiaSlashSpanComparer = &pebble.Comparer{
+		Compare:            CompareWithSlash,
+		Equal:              pebble.DefaultComparer.Equal,
+		AbbreviatedKey:     pebble.DefaultComparer.AbbreviatedKey,
+		FormatKey:          pebble.DefaultComparer.FormatKey,
+		FormatValue:        pebble.DefaultComparer.FormatValue,
+		Separator:          pebble.DefaultComparer.Separator,
+		Split:              pebble.DefaultComparer.Split,
+		Successor:          pebble.DefaultComparer.Successor,
+		ImmediateSuccessor: pebble.DefaultComparer.ImmediateSuccessor,
+		Name:               "oxia-slash-spans",
+	}
+)
+
 type PebbleFactory struct {
 	dataDir string
 	cache   *pebble.Cache
@@ -171,19 +186,8 @@ func newKVPebble(factory *PebbleFactory, namespace string, shardId int64) (KV, e
 	}
 
 	pbOptions := &pebble.Options{
-		Cache: factory.cache,
-		Comparer: &pebble.Comparer{
-			Compare:            CompareWithSlash,
-			Equal:              pebble.DefaultComparer.Equal,
-			AbbreviatedKey:     pebble.DefaultComparer.AbbreviatedKey,
-			FormatKey:          pebble.DefaultComparer.FormatKey,
-			FormatValue:        pebble.DefaultComparer.FormatValue,
-			Separator:          pebble.DefaultComparer.Separator,
-			Split:              pebble.DefaultComparer.Split,
-			Successor:          pebble.DefaultComparer.Successor,
-			ImmediateSuccessor: pebble.DefaultComparer.ImmediateSuccessor,
-			Name:               "oxia-slash-spans",
-		},
+		Cache:        factory.cache,
+		Comparer:     OxiaSlashSpanComparer,
 		MemTableSize: 32 * 1024 * 1024,
 		Levels: []pebble.LevelOptions{
 			{