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Multiple orion with single mongodb instance fails to process subscriptions

I am trying to connect multiple orion instances to the same mongodb backend. While I am able to recieve context data from South bound iot devices into orion, only one among the orion instances is processing the onchange subscription request registered for onchange of context data of an entity attribute.

Is it a valid practice to have multiple orion instances connect to the same mongodb backend and if so, if 2 different orion instances recieve context attribute data of the same entity will it trigger pre-registered onchange subscription.

Do I need to configure something in orion or Mongo for this to work

I am using orion 0.23 and Mongo 3.4