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      20.1.1 Replication Technologies
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       20.1.1.1 Source to Replica Replication
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       20.1.1.2 Group Replication
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   Before getting into the details of MySQL Group Replication, this
      section introduces some background concepts and an overview of how
      things work. This provides some context to help understand what is
      required for Group Replication and what the differences are
      between classic asynchronous MySQL Replication and Group
      Replication.
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