hailin0 commented on issue #4021:
URL:
https://github.com/apache/incubator-seatunnel/issues/4021#issuecomment-1410304057
example
Add interface
```java
public interface SupportExctlyOnce {
}
```
Source or Sink implement interface
```java
public class MySource implements SeaTunnelSource, SupportExctlyOnce {
}
```
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