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Can multiple fiware orion work with same mongodb backend?

I have tried connecting multiple orion instances from different machines to the same mongodb backend. The issue I have observed is that only one among the orion instances is able to process onchange subscription registered against attribute of an entity.

My question is - is it a valid practice of having multiple active instances of orion independantly handling incoming requests connected to the same mongodb backend. Does such a deployment configuration work in the same manner, in comparision to single instance of orion connected to mongodb backend.

I have tried this with orion version 0.23 and mongodb version 3.4