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每个节点都会产生事务，也就有了自己的gtid。
但是最终会选择以group_name:gtid作为mgr的gtid进行广播，这时候不应该这么看，而应该直接看：
- select CHANNEL_NAME, VIEW_ID, MEMBER_ID, LAST_CONFLICT_FREE_TRANSACTION from performance_schema.replication_group_member_stats where CHANNEL_NAME = 'group_replication_applier' and MEMBER_ID=@@server_uuid\G
- *************************** 1. row ***************************
- CHANNEL_NAME: group_replication_applier
- VIEW_ID: 16908564382802935:3
- MEMBER_ID: 5e34a5e2-feb6-11ed-b288-d08e7908bcb1
- LAST_CONFLICT_FREE_TRANSACTION: 33c2e34c-1f8c-11ee-b476-d08e7908bcb1:296291512
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