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One concern about switching to a TCP-based protocol is that network outages may result in TCP sockets hanging on read or write operations. We need to ensure that, if a connection to one member is blocked, we still send messages to the other members. Each destination will have its own queue of messages to be sent, and adding to one queue should never block.

The Messenger is also used by membership to check for a quorum of members, after a network partition event. So we need to ensure that we retain the ability to send a ping message out to all members and check for responses within a certain time window.

Changes and Additions to Public Interfaces

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