Whenever I put value in rocksdb for the same key. The value get updated. But the count by the following method db.getLongProperty(columnFamily, "rocksdb.estimate-num-keys") gets incremented. Why am I getting this weird behavior?
Whenever I put value in rocksdb for the same key, the value get updated and count also gets increased
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That is the expected behaviour in rocksdb. Note that the property is
estimate-num-keys, meaning it will only give you an estimate( not exact ) of the number of keys present in the db. You might have to run afull compactionon the column family to get the accurate number of keys present.Quoting from the WIKI,
You can also check the rocksdb option -
inplace_update_supportwhich will update the key if it exists in memtable itself instead of writing it again.