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a3f3563828
The bootstrap procedure starts by "waiting for range setup", which means waiting for a time interval specified by the `ring_delay` parameter (30s by default) so the node can receive the tokens of other nodes before introducing its own tokens. However it may sometimes happen that the node doesn't receive the tokens. There are no explicit checks for this. But the code may crash in weird ways if the tokens-received assuption is false, and we are lucky if it does crash (instead of, for example, allowing the node to incorrectly bootstrap, causing data loss in the process). Introduce an explicit check-and-throw-if-false: a bootstrapping node now checks that there's at least one NORMAL token in the token ring, which means that it had to have contacted at least one existing node in the cluster, which means that it received the gossip application states of all nodes from that node; in particular the tokens of all nodes. Also add an assert in CDC code which relies on that assumption (and would cause weird division-by-zero errors if the assumption was false; better to crash on assert than this). Ref #8889. Closes #8896