This project is a experiment that implement a very simple json data store that can partition the data accross several servers in a totally automatic way.

The idea is to have a pool of servers. You can add servers to your pool and some data will be automaticaly migrated from the old servers to the new one to equalize the load.

This experiment currently uses 256 clusters of data. Every json data is assigned to a cluster using the first 2 characters of the index (a md5 hexadecimal hash).

• An algorithm is used to determine to which server everyone of these clusters should go.
• Every server get the same amount of of clusters.
• Everytime a server is added to the pool the clusters are redistributed.
• The redistribution is designed to move the smallest amount of clusters and to move the same amount from every server.
• After a new host joined the pool, the clusters are automaticaly moved.

• Save pool configuration on disk.
• Implement a client library.
• Tests.
• Save documents in cluster directories.
• ...