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dnsdist: Refactoring of the TCP stack #7559
This PR completely changes the way dnsdist handles TCP connections, moving to an event-based mode that allows a single thread to handle a large number of connections, instead of only one. It makes DNS over TCP and DNS over TLS much more scalable.
IMHO merging this PR calls for the move to the 1.4.x branch at least, perhaps 2.0.x.