我的产品里到处是自增ID作为主键，同时也需要作为分区键，OTS产品的最佳实践的帮助里建议：自增id作为分区键拼接一个哈希前缀比较好，会将最近新写入的记录均匀分到各个分区里，单并没有说明原理，让人很费解。产生两个问题：分区键哈希的原理简单介绍一下？一直认为自增已经是每个键不一样了，且取模会很均匀了，为啥直接用会不均匀分配，哈希前缀具体应该如何哈希，那些哈希算法推荐？

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更新时间 2023-05-22 10:53:37

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