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socket_manager: add feature to share sockets with another server
Another process can take over UDP/TCP sockets without downtime. server = ServerEngine::SocketManager::Server.share_sockets_with_another_server(path) This starts a new server that shares all UDP/TCP sockets with the existing server. The old process should stop without removing the file for the socket after the new process starts. This allows us to replace both the server and the workers with new processes without socket downtime. (The existing live restart feature does not support network servers. We can restart workers without downtime, but there is no way to restart the network server without downtime.) ref: fluent/fluentd#4622 Limitation: This feature would not work well if the process opens new TCP ports frequently. Signed-off-by: Daijiro Fukuda <fukuda@clear-code.com> Co-authored-by: Shizuo Fujita <fujita@clear-code.com>
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