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javamongodbhibernatedatabase-replicationhibernate-ogm
Obaid Maroof
Obaid Maroof

Reputation: 1579

Hibernate configuration for MongoDB loadbalancing

I have got a small mongoDB cluster with 3 nodes (no sharding, only replication). Now the insertion to the primary node is propogating the new data to the secondary node as expected (basic replication). I am using java and hibernate.

Now what I want is to loadbalance the read requests among the whole replica set instead of primary node always being used to serve the data. Is there some way that I tell hibernate (through query string) about the available servers and somehow hibernate distributes the request (either randomly or in a systematic manner)? What would be the right way to achieve load balancing?

Upvotes: 4

Views: 171

Answers (1)

Gergely Bacso
Gergely Bacso

Reputation: 14661

The setting you are looking for is called read-preference. If you take a look at the doc here, you will find:

hibernate.ogm.mongodb.read_preference

Specifies the ReadPreference to be applied when issuing reads against the MongoDB datastore. Possible settings are (values of the ReadPreferenceType enum): PRIMARY, PRIMARY_PREFERRED, SECONDARY, SECONDARY_PREFERRED and NEAREST.

What you would probably use in this case is SECONDARY_PREFERRED, which effectively means that read operation will by default routed to slave nodes, but hibernate will fall back to primary if that is the only available node left.

Upvotes: 1

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