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Chris Lu 2018-06-17 13:40:15 -07:00
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@ -59,13 +59,13 @@ SeaweedFS is a simple and highly scalable distributed file system. There are two
1. to store billions of files!
2. to serve the files fast!
Instead of supporting full POSIX file system semantics, SeaweedFS chooses to implement only a key->file mapping. Similar to "NoSQL", you might call it "NoFS".
Instead of managing all file metadata in a central master, the central master only manages file volumes, and it lets these volume servers manage files and their metadata. This relieves concurrency pressure from the central master and spreads file metadata into volume servers, allowing faster file access (just one disk read operation).
SeaweedFS started as an Object Store to handle small files efficiently. Instead of managing all file metadata in a central master, the central master only manages file volumes, and it lets these volume servers manage files and their metadata. This relieves concurrency pressure from the central master and spreads file metadata into volume servers, allowing faster file access (just one disk read operation).
There is only a 40 bytes disk storage overhead for each file's metadata. It is so simple with O(1) disk read that you are welcome to challenge the performance with your actual use cases.
SeaweedFS started by implementing [Facebook's Haystack design paper](http://www.usenix.org/event/osdi10/tech/full_papers/Beaver.pdf). SeaweedFS is currently growing, with more features on the way.
SeaweedFS started by implementing [Facebook's Haystack design paper](http://www.usenix.org/event/osdi10/tech/full_papers/Beaver.pdf).
SeaweedFS can work very well with just the object store. [[Filer]] is added later to support directories and POSIX attributes. Filer is a separate linearly-scalable stateless server with customizable metadata stores, e.g., MySql/Postgres/Redis/Cassandra/LevelDB.
## Additional Features
* Can choose no replication or different replication level, rack and data center aware