Updated Filer Stores (markdown)

Filer-Stores.md

@@ -6,9 +6,9 @@ The Filer Store persists all file metadata and directory information.
 | ---------------- | -- | -- | -- | -- | -- | -- |
 | memory       | O(1)   | limited by memory | Local, Fast                | | Yes| for testing only, no persistent storage |
 | leveldb      | O(logN)| unlimited | Local, Very Fast               | | Yes| Default, fairly scalable |
-| RocksDB      | O(logN)| unlimited | Local, Very Fast               | | Native| Default, fairly scalable |
 | leveldb2     | O(logN)| unlimited | Local, Very Fast, faster than leveldb          | | Yes| Similar to leveldb, part of the lookup key is 128bit MD5 instead of the long full file path |
 | leveldb3     | O(logN)| unlimited | Local, Very Fast                               | | Yes| Similar to leveldb2, separate leveldb instance for each bucket |
+| RocksDB      | O(logN)| unlimited | Local, Very Fast               | | Native| Default, fairly scalable |
 | Mongodb      | O(logN)| unlimited | Local or Distributed, Fast     | | Yes| Easy to manage |
 | Redis        | O(1)   | limited   | Local or Distributed, Fastest  ||Native| one directory's sub file names are stored in one key~value entry |
 | Cassandra    | O(logN)| unlimited | Local or Distributed, Very Fast||Native|                |