A client uses the REST API to make a HTTP request to PUT an object into an existing container. The cluster receives the request. First, the system must figure out where the data is going to go. To do this, the account name, container name, and object name are all used to determine the partition where this object should live.
Then a lookup in the ring figures out which storage nodes contain the partitions in question.
The data is then sent to each storage node where it is placed in the appropriate partition. At least two of the three writes must be successful before the client is notified that the upload was successful.
Next, the container database is updated asynchronously to reflect that there is a new object in it.
