KAFKA-18379: Enforce resigned cannot transition to any other state in same epoch #19236
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… same epoch JIRA: KAFKA-18379 For further details, please refer to [KIP-996](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=272927537#KIP996:PreVote-ResignedStatechanges) and apache#18240 (comment). In short, this PR adds a check for the transition from the resigned state to other states to prevent a resigned leader from accidentally becoming its own follower in the same epoch, which would create an invalid circular reference.
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JIRA: KAFKA-18379
For further details, please refer to KIP-996 and #18240 (comment).
In short, this PR adds a check for the transition from the resigned state to other states to prevent a resigned leader from accidentally becoming its own follower in the same epoch, which would create an invalid circular reference.