type queue Queue
	parsedQueue := queue{}
	if err := d.DecodeElement(&parsedQueue, &start); err != nil {
		return err
	}

	if len(parsedQueue.Events) == 0 {
		return errors.New("missing event name(s)")
	}

	eventStringSet := set.NewStringSet()
	for _, eventName := range parsedQueue.Events {
		if eventStringSet.Contains(eventName.String()) {
			return &ErrDuplicateEventName{eventName}
		}

			return nil, err
		}
	}

	json := jsoniter.ConfigCompatibleWithStandardLibrary
	if err := json.Unmarshal(data, &srvCfg); err != nil {
		return nil, err
	}

	// Add any missing entries
	return srvCfg.Merge(), nil
}

// ConfigSys - config system.
type ConfigSys struct{}

// Init - initializes config system from config.json.
func (sys *ConfigSys) Init(objAPI ObjectLayer) error {

var deletedSubSysKeys = map[string][]string{
	APISubSys: {apiReplicationWorkers, apiReplicationFailedWorkers},
	// Add future sub-system deleted keys
}

// Merge - merges a new config with all the
// missing values for default configs,
// returns a config.
func (c Config) Merge() Config {
	cp := New()
	for subSys, tgtKV := range c {
		for tgt := range tgtKV {
			ckvs := c[subSys][tgt]