Chesnay Schepler created FLINK-6552:
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Summary: Ambiguous error message when retrieving multiple
side-outputs
Key: FLINK-6552
URL: https://issues.apache.org/jira/browse/FLINK-6552
Project: Flink
Issue Type: Improvement
Components: Streaming
Affects Versions: 1.3.0, 1.4.0
Reporter: Chesnay Schepler
When calling {SingleOutputStreamOperator#getSideOutput(OutputTag<X>} multiple
times with the output tags having different types you get the following
exception:
{code}
"Trying to add a side input for the same id with a different type. This is not
allowed."
{code}
This error message is ambiguous, as it could either mean that you cannot add 2
side outputs with the same name but different types or that 2 side outputs with
different types cannot be retrieved from a single operator.
Furthermore, the error message contains the concept of node id's (i guess?)
which users aren't exposed to. This is confusing and should be reworded to work
with operators.
Lastly, i find this limitation rather odd. It is possible for an operator to
have multiple side outputs. It is also possible to have a side output with a
different type than the main output. Yet, it is not possible to have multiple
side outputs with different types.
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