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The following change to the {{RocksDBConfigSetter}} interface is needed to get a cache that is possibly instantiated in an implementation of the config setter. Unfortunately, RocksDB's Java API does not offer a way to get the cache from the RocksDB instance. However, the metrics in this KIP need to know the cache that is used by the RocksDB instance to be able to aggregate the values correctly over the segments of a segmented state store.
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