out of sync on multiple istances

[bvgein]

When using this module on a multiple instances node, the cached object on one node gets out of sync when the object is changed and renewed in cache on another instance.

This cannot be resolved through a SE, because this it is runned on the first instance. Putting it in a multi-threaded task-queue might help, but this is not relyable (maybe one instance is too busy, and will not be assigned to run the task for refreshing the object).