11/7/2023 0 Comments Dropbox storage![]() ![]() ![]() The control plane manages traffic coordination, generates migration plans, and handles machine re-installations. The operation is done asynchronously, and once a commit happens in the primary region, the data is queued up for replication to another zone. The cross-zone replicator is the component performing cross-zone replication, storing data in multiple regions. When the system runs low on capacity, a new cell is opened up, allowing for horizontal scaling of the system. The cells are the isolation units where all the storage devices are located: they can be over 100 PBs and grow up to specific limits in size. The hash index is sharded by the hash, which is the key for a blob, and each hash is mapped to a cell or a bucket, along with a checksum. When a GET request is made, the hash index, a collection of sharded MySQL databases, is queried. Clients typically make PUT requests with keys and blobs, GET requests, delete calls, or perform scans for available hashes in the system. The first service is the frontend, which is the service that interacts with the clients. These are the different components of the Magic Pocket architecture in each zone. Databases and compute are not shared between pockets, and operate independently of each other. Magic Pocket can have multiple instances, such as a test pocket or a stage pocket before the production one. The system is built around pockets, which represent logical versions of everything in the system. SMR drives also have a conventional zone that allows for caching of random writes if necessary, which typically accounts for less than 1% of the total capacity of the drive.Īt a high level, the architecture of Magic Pocket consists of three zones: West Coast, Central, and East Coast. However, this is perfect for our workload patterns. ![]()
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