目录引言方案一：同步双写方案二：异步双写方案三：Logstash定时拉取方案四：Canal监听Binlog方案五：DataX批量同步方案六：Flink流处理总结引言
When I have to write methods which return two values, I usually go about it as in the following code which returns a List<string>. Or if I have to return e.g. a id and string, then I return a Li
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