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DYNAMIC ADJUSTMENT DGRADE #3
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DYNAMIC ADJUSTMENT DGRADE
名词约定
背景
当 TC 遇到故障时或者和 TC 通信出现问题会导致在 TM 执行「Begin、Commit、Rollback」等操作执行失败,从而整个事务也执行失败。
问题
值得注意的是,TM 在执行上述三个操作的时候,会因为失败而多次重试,并且过程都是同步的,即阻塞
解决
当 TC 出现问题或者连接不上 TC 时(即TC异常),分布式事务是会执行失败的。为了避免 TC故障导致 TM 执行无效的操作,现支持动态调整服务级别,即出现TC故障时,暂时关闭全局分布式事务,直到TC恢复正常
设计总共分为两个部分:
细节
01 在整个执行过程中,会发生非常多的异常,什么情况才算做是 TC 异常?
todo
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