Hi,

I want to apply a "keyBy operator on a stream".
The string is of type MyEvent. This is a simple type that contains 2 longs and 
and int or string

However, when applying this I get

Exception in thread "main" org.apache.flink.api.common.InvalidProgramException: 
This type (GenericType<Event>) cannot be used as key.

Can you give me a hint about a solution to this?

Thanks

Dr. Radu Tudoran
Research Engineer
IT R&D Division

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