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跟随者(follower)append分析问题 #320

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leehom opened this issue Jul 10, 2024 · 0 comments
Open

跟随者(follower)append分析问题 #320

leehom opened this issue Jul 10, 2024 · 0 comments

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@leehom
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leehom commented Jul 10, 2024

首先分析一下pendingMap的状态

image

pengding请求过时，writeIndex调回到水位线+1作为写入点，

  • 上图的上部分是初始状态
    writeIndex1 第一个批次请求；writeIndex2第二个批次请求，并已发送，pendingMap有两个数据
  • 上图的下部分，writeIndex1超时，调和writeIndex，请求重新发送，但批次数量会有所不同，形成新的writeIndex1(覆盖原有)，writeIndex2-x，而且writeIndex1的批量比原writeIndex1大，writeIndex2-x比原writeIndex2大，pendingMap有3个数据
    此时有两条发送线，不能说writeIndex2已废弃，可能跟随者已处理了原writeIndex1，只是回复失败，处理写入分析跟随者怎样处理

再看跟随者的处理
image
3.1.1 处理有点不解，按pendingMap分析，writeIndex2那批可能被返回不一致，处理没错，但本人认为更好的处理应该是保证写入点连续性即好，过期的请求删去就可以，一直走第二部分请求，若返回不一致，领导者进入比对，降低效率
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@leehom