Is it possible to have managed operator state where all the parallel
operators know that they have the same state? Therefore, it would be only
snapshotted by one of them and in case of failure (or rescaling) all would
use that snapshot.
For the rescaling case I guess I could use union redistribution and just
keep one of the elements of the list, but given the size of the state it
would be more efficient if this can be avoided.
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