Hi, 

Activating bloom filter in the RocksDB state backend improves read performance. 
Currently activating bloom filter can only be done by implementing a custom 
ConfigurableRocksDBOptionsFactory. I think we should provide an option to 
activate bloom filter via Flink configuration.  What do you think? If so, what 
about the following configuration?

state.backend.rocksdb.bloom-filter.enabled: false (default)
state.backend.rocksdb.bloom-filter.bits-per-key: 10 (default)
state.backend.rocksdb.bloom-filter.block-based: true (default) 


Thanks
Jun

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