9554b2fecb
Currently when there are no more auto follow patterns for a remote cluster then the AutoFollower instance for this remote cluster will be removed. If a new auto follow pattern for this remote cluster gets added quickly enough after the last delete then there may be two AutoFollower instance running for this remote cluster instead of one. Each AutoFollower instance stops automatically after it sees in the start() method that there are no more auto follow patterns for the remote cluster it is tracking. However when an auto follow pattern gets removed and then added back quickly enough then old AutoFollower may never detect that at some point there were no auto follow patterns for the remote cluster it is monitoring. The creation and removal of an AutoFollower instance happens independently in the `updateAutoFollowers()` as part of a cluster state update. By adding the `removed` field, an AutoFollower instance will not miss the fact there were no auto follow patterns at some point in time. The `updateAutoFollowers()` method now marks an AutoFollower instance as removed when it sees that there are no more patterns for a remote cluster. The updateAutoFollowers() method can then safely start a new AutoFollower instance. Relates to #36761 |
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