ConcurrentLinkedHashMap
ConcurrentLinkedHashMap requires a minimum weight of 1. Like Guava, Caffeine allows a minimum weight of 0 to indicate that the entry will not be evicted due to a size-based policy.
ConcurrentLinkedHashMap processes eviction notifications from a queue that any calling thread may take from. Caffeine delegates to the configured executor (default: ForkJoinPool.commonPool()).
ConcurrentLinkedHashMap retains the entries and discards the eviction order when serializing. Caffeine, like Guava, retains only the configuration and no data.
