ruby on rails - MongoDB: Different applications connecting to different replicas -

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we use mongodb central database our application; consumer facing mobile app. @ present 7-member replica-set replica-set-1 being master @ moment. backend connects mongo replica build in ruby on rails , use mongoid odm.

there 3 pieces connecting mongodb replica-set.

  1. the consumer application
  2. the admin , customer care management application
  3. the data retrieval application ( analytics , such purposes )

all these 3 apps connect same replica set of now.

what know whether possible connect different applications specific replicas. 

for example, mobile app connects primary writes , replicas 2-4  read; customer care management application connects primary  ( writes ) , replicas 5-7 reads.

i dont think explicitly mentioning specific replicas in mongoid.yml configuration working. though have mentioned replica-set-7 in mongoid hosts file data retrieval application, see queries in log file of replica-set-2 , 3.

so obviously, mongodb decides criteria distribute queries among replicas despite configuration specified @ client mongoid end.

i love know if such thing possible @ using mongodb , mongoid solve lot of our load issues. right heavy queries customer care , data retrieval apps affects consumer facing mobile app well; reads not segragated. separate out reads.

also, if @ possible, again have eyes raised on possible pitfalls this; specially 3 applications can write db. example, replica-3 becomes primary after election , not explicitly mentioned in configuration of data retrieval application. might happen there become concern.

i not @ sure whether possible; wanted know if theres way figure out this. appreciable.

when connect member of replica set, client told full state of replica set , can connect of them. initial set of hosts seeds process - long application can reach 1 of hosts, doesn't matter hosts in configuration.

mongo have concept of tagged replica set members. when creating connection or executing query can specify tags use select replica set member read from.


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