dc02b32650
Today we maintain a map of open connections in order to close them when a low level channel gets closed or handles a failure. We also spawn a thread due to some tricky concurrency issues especially with respect to netty since they listener might be called on a transport / boss thread. Executions on those threads must not be blocking since otherwise we will likely deadlock the event processing which adds to the complexity of the concurrency model in this class. This change associates the connection with the close callback that every channel invokes once it's closed which allows us to remove the connections map. A relaxed non-blocking concurrency model in the connection close listener allows cleaning up connected nodes without blocking on any lock. |
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