Github user sihuazhou commented on the issue:
https://github.com/apache/flink/pull/6020
Have't received any response from RocksDB yet, but I found this example
with using `RocksIterator#stats()`:
https://github.com/facebook/rocksdb/blob/3453870677ee2648f38d70fe8aa7fa16a93a96d2/java/samples/src/main/java/RocksDBSample.java---
