Is it possible to use different ports for nodes in a Cassandra cluster?

Question

We are programmatically creating Cassandra nodes (auto-generating yaml and using CassandraDaemon). Ideally we would be able to use different ports on different hosts due to configuration needs. Is this possible (via seed specification or implementation of a custom class)? It seems that the seeds list can only take IP addresses and not ports.

Answer 1

After looking at the relevant source in the Cassandra network code, it is apparent that this is not supported. In the newSocket() method, the port for the remote node is obtained from the static DatabaseDescriptor.getSSLStoragePort() (excerpt below). This does not provide a different value per host or any hook to do so:

public Socket newSocket() throws IOException
{
    // zero means 'bind on any available port.'
    if (isEncryptedChannel())
    {
        return SSLFactory.getSocket(DatabaseDescriptor.getEncryptionOptions(), endPoint(), DatabaseDescriptor.getSSLStoragePort(), FBUtilities.getLocalAddress(), 0);
    }
    else {
        return new Socket(endPoint(), DatabaseDescriptor.getStoragePort(), FBUtilities.getLocalAddress(), 0);
    }
}

Answer 2

take a look at https://github.com/pcmanus/ccm , they are using multipe cassandra instances on the same node. you can see how they are doing it.