Java RocksDB 6.4.6 returning -24 for rocksdb.estimate-num-keys
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Description
Java RocksDB version 6.4.6: I'm using db.getLongProperty("rocksdb.estimate-num-keys") and getting -24 back. Now - I know I read somewhere that a negative value *could* be returned in this property in versions prior to 5.8, but I cannot find that reference anywhere now.
### Expected behavior
Returns a positive value that is the estimated number of keys in the database.
### Actual behavior
Returning a negative value (-24 - have also seen -135).
### Steps to reproduce the behavior
Just call the Property under the write set of conditions (I suppose).
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