dledger模式下的mq集群，重启broker主从切换会出现消息丢失 #7476
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主从同步是异步的，理论上是会丢消息；建议改成同步的；其次没有不丢消息的中间件，金融类建议加上本地消息表做重试 |
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感谢你的回复，这个问题确认了是dledger broker在异常重启时index file可能会被删掉但是未被重建，导致根据msgId查询异常 |
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1、搭建的4.9.2版本的dledger集群，发送一批消息后，重启master broker模拟主从切换，切换后发现消息有丢失
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