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8ca1432b04
When a node start it does not have any information about cache temperature of other nodes in the cluster and it is hard (if not impossible) to make right guess. During cluster startup all nodes have cold caches, so there is no point to redirect reads to other nodes even though local cache it cold, but if only that node restarted than other nodes have populated cache and reads should be redirected. The node will get up-to-date information about other nodes caches, but only after receiving first reply, until then it does not have the information to make right decisions which may cause unwanted spikes immediately after restart. Having cache temperature in gossiper helps to solve the problem.