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83850e247a
Changing configuration involves two entries in the log: a 'joint configuration entry' and a 'non-joint configuration entry'. We use `wait_for_entry` to wait on the joint one. To wait on the non-joint one, we use a separate promise field in `server`. This promise wasn't connected to the `abort_source` passed into `set_configuration`. The call could get stuck if the server got removed from the configuration and lost leadership after committing the joint entry but before committing the non-joint one, waiting on the promise. Aborting wouldn't help. Fix this by subscribing to the `abort_source` in resolving the promise exceptionally. Furthermore, make sure that two `set_configuration` calls don't step on each other's toes by one setting the other's promise. To do that, reset the promise field at the end of `set_configuration` and check that it's not engaged at the beginning. Fixes #11288. Closes #11325 * github.com:scylladb/scylladb: test: raft: randomized_nemesis_test: additional logging raft: server: handle aborts when waiting for config entry to commit