As a said back on
CASSANDRA-3316, I see forceTerminateAllRepairSessions more as a band-aid solution to avoid having someone stuck until we better handle repair failures and have a correct to stop it. But it isn't really a very use friendly solution since it doesn't stop properly the repair (it won't stop the validation compaction (though we can do that by other means now), nor any streaming that would be running) and you have to run it everywhere. For all those reason, my opinion is that we should keep this JMX only, I see no good reason to promote it to nodetool. That's just an opinion though.