avoid comparing data when fixing

Author: mmsqe

versiondb/tsrocksdb/store.go

@@ -262,18 +262,25 @@ func (s Store) fixDataStore(storeName string, dryRun bool) error {
 	prefix := storePrefix(storeName)
 	readOpts := grocksdb.NewDefaultReadOptions()
 	defer readOpts.Destroy()
+
+	cacheKeyValues := make(map[string][]byte)
 	for _, pair := range pairs {
 		realKey := cloneAppend(prefix, pair.Key)
 
-		readOpts.SetTimestamp(pair.Timestamp)
-		oldValue, err := s.db.GetCF(readOpts, s.cfHandle, realKey)
-		if err != nil {
-			return err
-		}
+		oldData, ok := cacheKeyValues[string(realKey)]
+		if !ok {
+			readOpts.SetTimestamp(pair.Timestamp)
+			oldValue, err := s.db.GetCF(readOpts, s.cfHandle, realKey)
+			if err != nil {
+				return err
+			}
 
-		clean := bytes.Equal(oldValue.Data(), pair.Value)
-		oldValue.Free()
+			oldData = oldValue.Data()
+			oldValue.Free()
+			cacheKeyValues[string(realKey)] = oldData
+		}
 
+		clean := bytes.Equal(oldData, pair.Value)
 		if clean {
 			continue
 		}