MongoDB Synchronizing multiple Shards I've got the following layout Picture Cluster
RZ West is my first data center A and RZ Ost my second data center B. As you can see one secondary database of each cluster is available in the other data center.
Is it possible to read data out of Secondary 2 OST (B) and add it to the master database Primary WEST (A) automatically?
To understand the question this solved question could be helpful https://stackoverflow.com/questions/22988773/mongodb-multiple-masters-in-replicaset
Thank you very much in advance
Greetings,
Daniel
If it's not possible to do it automatically, can it be done manually? So only entries which are not present in the primary database A will be inserted out of one secondary of database B ?

Little Example: In A we got: 1,2,3 In B we got: 5,6,7

What I want is to add 5,6,7 from database B into database A and vice versa, so it looks like this at the end:

A: 1,2,3,5,6,7

B: 5,6,7,1,2,3