seata xa执行流程

Seata XA执行流程可以分为以下几个步骤：

1. 开始全局事务：当一个全局事务开始执行时，当前线程本地变量副本中的xid为null，表示当前不存在一个全局事务。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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