Cassandra Datastax Driver - Connection Pool

Question

I'm trying to understand the connection pooling in Datastax Cassandra Driver, so I can better use it in my web service. I have version 1.0 of the documentation. It says: The Java driver uses connections asynchronously, so multiple requests can be submitted on the same connection at the same time. What do they understand by connection? When connecting to a cluster, we have: a Builder, a Cluster and a Session. Which one of them is the connection? For example, there is this parameter: maxSimultaneousRequestsPerConnection - number of simultaneous requests on all connections to a host after which more connections are created. So, these connections are automatically created, in the case of connection pooling (which is what I would expect). But what exactly are the connections? Cluster objects? Sessions? I'm trying to decide what to keep 'static' in my web service. For the moment, I decided to keep the Builder static, so for every call I create a new Cluster and a new Session. Is this ok? If…

Accepted Answer

You are right, the connection is actually in the Session, and the Session is the object you should give to your DAOs to write into Cassandra.

As long as you use the same Session object, you should be reusing connections (you can see the Session as being your connection pool).

Edit (2017/4/10) : I precised this answer following @William Price one. Please be aware that this answer is 4 years old, and Cassandra have changed a fair bit in the meantime !

Cassandra Datastax Driver - Connection Pool

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