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1·If the event store outgrows a single machine, then it is easy to shard first by aggregate type, and with a little content-based routing even at the level of aggregates themselves.

如果事件存储器在一台机器上满了，那么根据聚合类型先进行分片处理是很容易的，然后还能根据聚合自己那一层再进行基于内容的路由分片。