Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1562#issuecomment-177839471
@gyfora you're right, I will add default implementations for ListState and
ReducingState and use them in the DbStateBackend. For RocksDB there are custom
implementations, for example in ListState I can append a value to the state
with one call instead of a get-update-put operation.
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