Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2135
For the default scope it occurs if either
- 2 jobs are executed for which the name is equal
- within a job there are 2 tasks for which the name is equal
- within a job there are 2 operators for which the name is equal
For the streaming API the third case is virtually guaranteed due to simple
names like "Map".
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