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2PC 二阶段提交的缺陷？

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2PC 二阶段提交的缺陷？

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第4点中提到，无法确认事务是否已经提交，但为什么不查询所有参与者的提交状态，参与者提交不都会写日志吗？

然后我有转念一想，是不是宕掉的参与者未启动起来，所以无法查询日志?那也不对啊，参与者未启动起来，那就无法提供服务，也就不会出现数据不一致现象了，有此疑惑，求大佬解答


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  • 参与者宕机了，所以查询不了状态。
  • 宕机的参与者在随后的某个时间重启，假如它宕机前就commit了事务。则此时它的数据和其它参与者不一致

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