According to [documentation](http://curator.apache.org/curator-framework/index.html) 

> 
> CuratorFramework instances are fully thread-safe. You should share one
>  CuratorFramework per ZooKeeper cluster in your application.
> 
> 
> 

It also states that the method *start* should be called before any other operations can be performed. Should this method be called before every operation or calling it once after initialization is enough?