Is there any dependency of translators

[chenxinxu333]

As some translators hooked together to perform a function is called a graph. This translators are defined in /var/lib/glusterd/vols/***.vol.
If A translator is defined as subvolumes of B translator, will glusterfs crash if B is defined as subvolumes of A? I guess it has some rules or dependency for these translators as posix translator must be last one of server side. Is there any official rule for this?