code: func (c *RegionCache) ReloadStoreAddr(bo *Backoffer, id uint64) (string, error) {
  	addr, err := c.loadStoreAddr(bo, id)
  	if err != nil || addr == "" {
  		return "", errors.Trace(err)
  	}
  
  	c.storeMu.Lock()
  	defer c.storeMu.Unlock()
  	c.storeMu.stores[id] = &Store{
  		ID:   id,
  		Addr: addr,
  	}
  	return addr, nil
  }
docs: // ReloadStoreAddr reloads store's address.