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A problem of DDL apply in parallel replication
hi kristian ,
Maybe you have encountered this problem and fixed it, that is a DDL statement Query event has a Gtid event ahead, but has no end_event (like xid_event, commit or rollback) behind. so in the latest codes of parallel replication, count_queued_event_groups will increase but count_committing_event_groups will not for DDL. it would lead next event_group wait forever I guess.