求教 6.824 lab2B TestFailAgree2B 怎么过啊?要被搞蒙了。。 - V2EX
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duwan

求教 6.824 lab2B TestFailAgree2B 怎么过啊?要被搞蒙了。。

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  •   duwan Aug 11, 2020 1997 views
    This topic created in 2087 days ago, the information mentioned may be changed or developed.
    当重新连接一个节点时,当发“106”命令时 总是报:apply error: server 0 apply out of order 7

    当发完 106 命令时我的日志如下:[{1 101} {1 102} {1 103} {1 104} {1 105} {1 106} {8 106}]

    我的程序流程应该是这样的:

    1. 重连节点(例如为节点 3 )
    2. Leader (节点 1 )收到命令“106”,存入日志并成功 commited (因为节点 2 也成功),但是由于 Term 为 1 直接被刚刚重连的节点 3 拒绝(节点 3 由于网络故障一直触发选、举且不成功,节点 3 此时当前 Term 为 7 )
    3. Leader 收到节点 3 的拒绝,发现节点 3 的 term 比它大。重新触发选、举,并当选。Term 为 8
    4. test 程序又重试,重新发送命令“106”
    5. 所以日志会有两条"106"命令[{1 101} {1 102} {1 103} {1 104} {1 105} {1 106} {8 106}]

    大家帮忙看看我的这个流程哪里有问题啊?
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