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关于kafka的问题?

kafka的问题,如下图:image
为何是2n+1。如果容忍2台机器故障,总共4个副本(也就是2n个)不行吗?有半数以上,也就是3台机器成功复制了,那么无论是哪两台故障,也有一台成功复制,这不也行吗?2n+1不是多了一个?


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图中的意思是选举leader时需要2n+1个节点,偶数的话可能会出现得票相同的情况。


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