![]() For brand new files, this is often all of them. If not, the commit call returns “need blocks” indicating which blocks are missing. ![]() The metaserver checks to see if a) Those hashes are known. Dropbox Desktop Client Protocolįirst, we will discuss the protocol prior to streaming sync, to motivate this work.Įach desktop client keeps a cursor (a JID) of its location in SFJ for each of its namespaces, which allows it to communicate how ‘up-to-date’ it is with the server.įirst, let’s discuss what happens on an uploading client when a file appears! The client first attempts to ‘commit’ the blocklist to the server under the (namespace, path). When a user makes changes to a file on Dropbox we record all of the alterations in a separate system called FileJournal. Immutability makes our lives a lot easier. It stores encrypted chunks of files up to 4 megabytes in size, and once a block is written to the system it never changes. ![]() The servers communicate via internal RPCs when necessary. Magic Pocket is an immutable block storage system.
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