Comments - Parallel Replication
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knielsen is right. To repeat/rephrase: Parallel replication is replication with parallel execution of INSERT, UPDATE, and DELETE queries on slaves. It's the correct use of the word parallel. It is not multi-master or multi-source replication.
What you're doing is fixating on the word parallel, coming up with your own ideas about what the word means, and willfully ignoring the replication part.