It would contain the same activity identifier as Coordinator Ca, but when App2 registers for the Durable2PC protocol to its Coordinator, Cb, its request is forwarded directly to Coordinator Ca.
它将包括与协调器Ca相同的活动标识符，但是当App2向它的协调器Cb注册Durable2 PC协议的时候，它的请求直接传送给了协调器Ca。
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