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两阶段提交

总结

  • 两阶段是指：准备提交，提交（终止）
    • 准备包括：每个节点的本地事务，写日志，做提交、回滚准备
    • 执行包括：分布式提交
  • 为了使分布式事务提交保持一致性
  • 跨多个节点的事务操作，每个节点只能知道自己的状态，需要有类似admin的中心节点来收集状态，再做决策，是终止（abort）还是执行（execute）
    • 中心节点的可用性如何保证？

缺点

  • 同步阻塞（很慢）
  • 单点问题，宕机阻塞
  • 数据不一致，网络延时，丢包，或者部分机器故障无法执行admin命令

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