freezhan commented on pull request #12157:
URL: https://github.com/apache/flink/pull/12157#issuecomment-656480710
@aljoscha How about letting the user pass this prefix parameter, then then
also add a check inside the generator to verify that we really obey the length
cap.
Transaction.id should have a business meaning.
I don't think the following lengthy context makes any sense, it's not
readable if it's too long, right
```java
getRuntimeContext().getTaskName() + "-" + ((StreamingRuntimeContext)
getRuntimeContext()).getOperatorUniqueID()
```
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