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Posted to commits@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/12/12 08:51:11 UTC

[GitHub] [rocketmq] lizhimins commented on issue #5663: Messages may be lost when SyncStateSet expand in extreme scenarios

lizhimins commented on issue #5663:
URL: https://github.com/apache/rocketmq/issues/5663#issuecomment-1346106845

   这个场景仅会发生在允许自动降级时。A觉得B宕了，A自己又宕了，本身已经超越了 SLA 的要求（2副本下副本全挂）
   
   本质上这里只是个选可用性还是选一致性的问题。目前的设计为了保证可用性所以允许写，在 A 重启成功后也可以通过回发把分叉的数据送给 B，类似于 container 中的 escape bridge 设计。如果要保证数据一致性，把 syncStateSet 收缩移动到 alert controller 成功之后就可以了，这样的话消息就会发送失败了。


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