This tells us that the output stream or results of the DTQ are flowing to a single coordinator partition, which implies that the cardinality at DTQ (2) does not need to be multiplied by 2.
这告诉我们，输出流(即d TQ的结果)流向一个协调器分区，这意味着DTQ(2)的基数不需要乘以2。
A two-phase commit allows several cooperating entities, known as resource managers, to participate in a single distributed unit of work coordinated by a transaction coordinator.
两阶段提交允许多个协作实体(称为资源管理器)参与到由事务协调器进行协调的单个分布式工作单元中。
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