Spring TCP Client Server max connections

Question

Trying to build a TCP server using Spring Integration in which keeps connections may run into thousands at any point in time. Key concerns are regarding

1. Max no. of concurrent client connections that can be managed as session would be live for a long period of time.
2. What is advise in case connections exceed limit specified in (1).

Something along the lines of a cluster of servers would be helpful.

Answer 1

There's no mechanism to limit the number of connections allowed. You can, however, limit the workload by using fixed thread pools. You could also use an ApplicationListener to get TcpConnectionOpenEvents and immediately close the socket if your limit is exceeded (perhaps sending some error to the client first).

Of course you can have a cluster, together with some kind of load balancer.