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cd7d64f588
The new verb is used to replace the current gossip shadow round implementation. Current shadow round implementation reuses the gossip syn and ack async message, which has plenty of drawbacks. It is hard to tell if the syn messages to a specific peer node has responded. The delayed responses from shadow round can apply to the normal gossip states even if the shadow round is done. The syn and ack message handler are full special cases due to the shadow round. All gossip application states including the one that are not relevant are sent back. The gossip application states are applied and the gossip listeners are called as if is in the normal gossip operation. It is completely unnecessary to call the gossip listeners in the shadow round. This patch introduces a new verb to request the exact gossip application states the shadow round needed with a synchronous verb and applies the application states without calling the gossip listeners. This patch makes the shadow round easier to reason about, more robust and efficient. Refs: #6845 Tests: update_cluster_layout_tests.py