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Updated Directories and Files (markdown)

Chris Lu 2019-01-08 20:30:01 -08:00
parent ab2db88872
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Directories-and-Files.md

@ -76,14 +76,14 @@ For directory renaming, it will be O(N) operations, with N as the number of file
The Filer Store persists all file metadata and directory information. The Filer Store persists all file metadata and directory information.
| Filer Store Name | Lookup | number of entries in a folder | Scalability | Note | | Filer Store Name | Lookup | number of entries in a folder | Scalability | TTL | Note |
| ---------------- | -- | -- | -- | -- | | ---------------- | -- | -- | -- | -- | -- |
| memory | O(1) | limited by memory | Local, Fast | for testing only, no persistent storage | | memory | O(1) | limited by memory | Local, Fast | | for testing only, no persistent storage |
| LevelDB | O(logN)| unlimited | Local, Very Fast | Default, fairly scalable | | LevelDB | O(logN)| unlimited | Local, Very Fast | | Default, fairly scalable |
| Redis | O(1) | limited | Local or Distributed, Fastest | one directory's sub file names are stored in one key~value entry | | Redis | O(1) | limited | Local or Distributed, Fastest |Yes| one directory's sub file names are stored in one key~value entry |
| Cassandra | O(logN)| unlimited | Local or Distributed, Very Fast| | | Cassandra | O(logN)| unlimited | Local or Distributed, Very Fast|Yes| |
| MySql | O(logN)| unlimited | Local or Distributed, Fast | Easy to manage, export | | MySql | O(logN)| unlimited | Local or Distributed, Fast | | Easy to manage, export |
| Postgres | O(logN)| unlimited | Local or Distributed, Fast | Easy to manage, export | | Postgres | O(logN)| unlimited | Local or Distributed, Fast | | Easy to manage, export |
#### Switching between different Stores #### Switching between different Stores
It is easy to switch between different filer stores (except memory store). It is easy to switch between different filer stores (except memory store).