原答案：难道不是topic的扩展能力吗？不然单topic的容量只能限制在物理机上了 更新后的答案： The partitions in the log serve several purposes. First, they allow the log to scale beyond a size that will fit on a single server. Each inpidual partition must fit on the servers that host it, but a topic may have many partitions so it can handle an arbitrary amount of data. Second they act as the unit of parallelism—more on that in a bit. 官方文档（见上文）。 partitions 主要有两个目的，1 增强扩展能力，让其可以处理任意多的数据 2 作为并行单元，提高并行能力（主要鉴于此点考虑）。 第一次回答我只记住第一点了~~sorry
原答案：难道不是topic的扩展能力吗？不然单topic的容量只能限制在物理机上了
更新后的答案：
The partitions in the log serve several purposes. First, they allow the log to scale beyond a size that will fit on a single server. Each inpidual partition must fit on the servers that host it, but a topic may have many partitions so it can handle an arbitrary amount of data. Second they act as the unit of parallelism—more on that in a bit.
官方文档（见上文）。
partitions 主要有两个目的，1 增强扩展能力，让其可以处理任意多的数据 2 作为并行单元，提高并行能力（主要鉴于此点考虑）。
第一次回答我只记住第一点了~~sorry