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Alexander KukushkinandGitHub
e9ba775959
1. when evaluating whether there are healthy nodes for a leader race before demoting we need to take into account quorum requirements. Without it the former leader may end up in recovery surrounded by asynchronous nodes.
2. QuorumStateResolver wasn't correctly handling the case when the replica node quickly joined and disconnected, what was resulting in the following errors:
```
File "/home/akukushkin/git/patroni/patroni/quorum.py", line 427, in _generate_transitions
yield from self.__remove_gone_nodes()
File "/home/akukushkin/git/patroni/patroni/quorum.py", line 327, in __remove_gone_nodes
yield from self.sync_update(numsync, sync)
File "/home/akukushkin/git/patroni/patroni/quorum.py", line 227, in sync_update
raise QuorumError(f'Sync {numsync} > N of ({sync})')
patroni.quorum.QuorumError: Sync 2 > N of ({'postgresql2'})
2025-02-14 10:18:07,058 INFO: Unexpected exception raised, please report it as a BUG
File "/home/akukushkin/git/patroni/patroni/quorum.py", line 246, in __iter__
transitions = list(self._generate_transitions())
File "/home/akukushkin/git/patroni/patroni/quorum.py", line 423, in _generate_transitions
yield from self.__handle_non_steady_cases()
File "/home/akukushkin/git/patroni/patroni/quorum.py", line 281, in __handle_non_steady_cases
yield from self.quorum_update(len(voters) - self.numsync, voters)
File "/home/akukushkin/git/patroni/patroni/quorum.py", line 184, in quorum_update
raise QuorumError(f'Quorum {quorum} < 0 of ({voters})')
patroni.quorum.QuorumError: Quorum -1 < 0 of ({'postgresql1'})
2025-02-18 15:50:48,243 INFO: Unexpected exception raised, please report it as a BUG
```