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waterm310n avatar waterm310n commented on June 9, 2024 1

以我的理解，在你所举的例子中B当前的任期是1，状态时Follower或者Leader，它的log如下
LogIndex:0 Cmd:Nil Term:0|LogIndex:1 Cmd:any Term:1|LogIndex:2 Cmd:any Term:1
A当前的任期是2，状态是Candidate，它的log如下
LogIndex:0 Cmd:Nil Term:0|LogIndex:1 Cmd:any Term:1|
你的意思是有可能存在另一个C它与B是相同的日志，然后因为符合大多数原则，所以C与B应用了LogIndex1,2，所以此时如果同意A的投票请求，就会出错。
作者的isLogUpToDate方法接受了两个参数LastLogIndex与LastLogTerm，应该就足够实现这个逻辑了吧？
B可以检查完Term后，拿自己的LastLogIndex与A的LastLogIndex相比，发现比A的大，isLogUpDate就可以返回false了吧？

from mit6.824-2021.

Amadeus-1048 avatar Amadeus-1048 commented on June 9, 2024

以我的理解，在你所举的例子中B当前的任期是1，状态时Follower或者Leader，它的log如下 LogIndex:0 Cmd:Nil Term:0|LogIndex:1 Cmd:any Term:1|LogIndex:2 Cmd:any Term:1 A当前的任期是2，状态是Candidate，它的log如下 LogIndex:0 Cmd:Nil Term:0|LogIndex:1 Cmd:any Term:1| 你的意思是有可能存在另一个C它与B是相同的日志，然后因为符合大多数原则，所以C与B应用了LogIndex1,2，所以此时如果同意A的投票请求，就会出错。 作者的isLogUpToDate方法接受了两个参数LastLogIndex与LastLogTerm，应该就足够实现这个逻辑了吧？ B可以检查完Term后，拿自己的LastLogIndex与A的LastLogIndex相比，发现比A的大，isLogUpDate就可以返回false了吧？

是的，我的理解有误，A节点的任期大不代表其日志的任期也更大，感谢解答。

from mit6.824-2021.

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