Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2345
We are very much trying to avoid different db instances per operator. Each
db instance will add quite a big new memory footprint. For higher
max-parallelism, this will be a problem.
The current philosophy in Flink was to avoid such situations, where a user
has to very carefully choose a parameter (like max parallelism) and where a
wrong setting for the parameter would lead to an unstable system.
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