Remote Client Service receives all requests from application,
and forwards the requests to the corresponding workers to process.
The requests are dispatched based on the hash value of the request key.
Workers process requests from disjoint subsets of keys.
Worker Service receives requests from the client service and translates the request messages
to the corresponding data structures.
Access Control checks the permission of each request before it is further processed.
Unauthorized requests will be rejected directly.
Head Version Table maintains the up-to-date head information for all named and unnamed branches.
Each update of a branch head is captured in the table and persisted on disk.
Data Type Manager hides chunk storage and internal data representation from worker logics.
When loading an object, it loads the corresponding data chunks and de-serializes them.
After an update operation is done, the object will be chunked and only new chunks are written back to chunk storage.
Chunk Storage is distributed across the cluster. It handles read/write chunk requests from the data type manager.