1）请问dm、上游mysql、下游tidb是什么版本？
2）确认dm可以拥有上游mysqld实例相应的权限
3）日志报错：
[2021/12/16 14:30:22.086 +08:00] [ERROR] [subtask.go:311] [“unit process error”] [subtask=sp-mysql-8] [unit=Sync] [“error information”=”{“ErrCode”:36069,“ErrClass”:“sync-unit”,“ErrScope”:“upstream”,“ErrLevel”:“high”,“Message”:“get binlog event error: io.CopyN failed. err read tcp 10.10.10.74:54308-\u003e143.120.123.189:33006: i/o timeout, copied 4931584, expected 16777215: connection was bad”,“Workaround”:“Please check if the binlog file could be parsed by mysqlbinlog .”}”]
看日志是解析binlog报错
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