CASSANDRA-19580: Fix replacing node stuck in hibernation state (4.0) #3972
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When a node is replaced, it announces itself as hibernated (one of the silent shutdown states). If the replacement fails, other nodes continue to see the replacing node in this state. As a result, the replacing node does not receive gossip messages from the seed upon subsequent startup, leading to an exception. This patch adds an explicit shutdown announcement via gossip to let other nodes know that the node was explicitly shutdown - as it was due to the exception. This allows other nodes (seeds in particular) to contact the replacing node at its next startup, allowing it to retry the replacement.
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When a node is replaced, it announces itself as hibernated (one of the silent shutdown states). If the replacement fails, other nodes continue to see the replacing node in this state. As a result, the replacing node does not receive gossip messages from the seed upon subsequent startup, leading to an exception.
This patch adds an explicit shutdown announcement via gossip to ensure other nodes correctly recognize the replacing node’s state, preventing it from getting stuck without receiving gossip messages. nodes know that the node was explicitly shutdown - as it was due to the exception. That allows other nodes (seeds in particular) to contact the replacing node at its next startup, thus allowing to retry the replacement.