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From Hannu Kröger <>
Subject Re: Cassandra client alternatives to mimic Couchbase sharding ???
Date Tue, 31 Dec 2013 14:15:39 GMT

DataStax Cassandra Java Driver has the possibility to choose the
coordinator node based on the partition key (TokenAwarePolicy), however
that probably does not solve the consistency problem you are thinking about:

If you really want to have full consistency, you should read this and tune
consitency level accordingly if you haven't already:


2013/12/31 Ryan, Brent <>

>  Assuming that you have a 3 node cassandra cluster with replication
> factor of 3 (so all nodes have the data)…
>  Does there exist a cassandra client that would allow a cassandra cluster
> to behave similarly to a couchbase cluster where for a given RowKey X, the
> client would always communicate to the same node in the cassandra cluster?
>  Essentially provides sharding at the client tier by RowKey.  The main
> reason for doing this would be to avoid some of the issues you run into
> with eventual consistency and allowing the cluster to resolve conflicts
> using server side timestamps?
>  I’m not sure exactly if this would work like I’d want, but thought it
> might be an interesting use case.  You might even be able to extend this
> behavior into the client further if the client is aware of the sharding
> algorithm being applied to the cluster so that you always communicate to a
> shard that has the data for a given row key.
>  Thoughts?
>  Thanks,
> Brent

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