Github user knaufk commented on the issue:
https://github.com/apache/flink/pull/2138
What about:
Add this accumulator. Throws an exception if the accumulator already exists
in the *same* Task.
Note that the namespace of Accumulators is scoped to the Flink Job, and
adding multiple accumulators with the same name *across* Tasks will still lead
to unexpected behaviour.
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