anchoring cassandra queries to particular DC

[Ganesh M]

Hi,

We have multiple DCs to store user data.
We are facing a problem if the data is stored in DC1 and it's fetched from DC2 and there's delay in data sync across DCs.
In the above case we may not find the data in DC2.

In order to solve this problem we're planning to anchor the users to particular DC and we want to execute queries in particular DC based on the user id.

Is there any provision in cpp driver to choose the DC to execute individual query?

Regards
Ganesh

[Michael Penick]

That would require a "preferred datacenter" load balancing policy and no such feature currently exists, but you could create two sessions each with a different local datacenters (set via `cass_cluster_set_load_balance_dc_aware()`), one for DC1 and another for DC2.

Mike

Ganesh

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[Ganesh M]

Thank you Michael for the response.
Can I know if there's any plan to provide this load balancing policy in near future. I think most of the products with mutli DC setup will need this policy.

Regards
Ganesh