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Our proposal for the new Messenger is to implement a TCP server and client using Netty. The Netty server and client will use the existing cluster SSL configuration. So if cluster SSL is enabled no additional properties will be required. See https://geode.apache.org/docs/guide/latest/managing/security/implementing_ssl.html for information on the relevant properties. The server socket will use the existing bind-address and membership-port-range properties to determine it's address and port.

The netty Netty based messenger will maintain one connection to each peer. When sending a message the messenger will create a connection to all destinations if no connection exists yet. Once a connection is established, the connection will remain open until the messenger is told to shut it down.

Messages received by the netty Netty server will be dispatched from netty Netty event loop threads. For this reason, it is important that message processing should not block, or it will prevent other messages from being received. The old JGroupsMessenger dispatched messages using a single jgroups receiver thread.

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