A particularly nasty effect here is that even if you have only potential avalanche, where a certain kind of change could affect large fraction of the output, even if it usually
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Mongo write and read concerns, akin to SQL transaction isolation levels: https://www.mongodb.com/docs/manual/core/causal-consistency-read-write-concerns/
用一句我听过的话形容，就是“我们一篇软文，可以养你好几年。”