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Estimate the scale of the system you are going to design...
Define what APIs are expected from the system...
/api/users/register: Register a new user./api/users/login: Authenticate user credentials./api/users/profile: Retrieve user profile details./api/files/upload: Upload a new file./api/files/download/{file_id}: Download a specific file./api/files/delete/{file_id}: Delete a file./api/files/metadata/{file_id}: Retrieve file metadata./api/folders/create: Create a new folder./api/folders/{folder_id}: Retrieve folder contents./api/folders/share: Share a folder with other users./api/sync/status: Check sync status for a device./api/sync/conflict/resolve: Resolve file conflicts./api/notifications: Fetch user notifications./api/notifications/mark_as_read: Mark notifications as read.Defining the system data model early on will clarify how data will flow among different components of the system. Also you could draw an ER diagram using the diagramming tool to enhance your design...
Usersuser_id (Primary Key): Unique identifier for each user.username: User’s display name.email: User’s email address.password_hash: Hashed password.created_at: Account creation timestamp.last_login: Last login timestamp.FileMetadatafile_id (Primary Key): Unique identifier for each file.user_id (Foreign Key): ID of the file owner.file_name: Name of the file.file_size: Size of the file in bytes.version: Current version of the file.replica_nodes: List of nodes storing replicas.created_at: File creation timestamp.updated_at: Last modified timestamp.chunk_id: Unique identifier.data: Binary data of the file chunk.checksum: Hash for data integrity validation.SyncStatussync_id (Primary Key): Unique identifier for each sync operation.device_id: ID of the device involved in the sync.file_id: ID of the synced file.status: Sync status (e.g., in-progress, completed, failed).last_synced_at: Timestamp of the last sync operation.Notificationsnotification_id (Primary Key): Unique identifier for each notification.user_id (Foreign Key): Associated user ID.type: Type of notification (e.g., shared file, sync update).content: Notification content.created_at: Timestamp of notification creation.read: Boolean indicating if the notification has been read.You should identify enough components that are needed to solve the actual problem from end to end. Also remember to draw a block diagram using the diagramming tool to augment your design. If you are unfamiliar with the tool, you can simply describe your design to the chat bot and ask it to generate a starter diagram for you to modify...
Manages user accounts, authentication, and authorization. It handles operations like registration, login, profile updates, and permission management for file sharing.
Stores and retrieves metadata about files and folders. This service does not handle the actual file data but tracks details like file size, owner, version, and location.
Stores actual file data in a distributed and fault-tolerant manner. Files are split into chunks, and each chunk is replicated across multiple nodes.
Handles real-time sync of files and folders across user devices. Tracks changes made to files and resolves conflicts in case of simultaneous updates.
Provides search capabilities for files and folders based on metadata or content. It indexes files for fast retrieval.
Notifies users about file updates, sync statuses, and shared file activity. Handles both real-time and batched notifications.
Enforces access control rules and provides data security features such as encryption.
Tracks system health, performance, and user activity. Logs important events for debugging and auditing.
Explain how the request flows from end to end in your high level design. Also you could draw a sequence diagram using the diagramming tool to enhance your explanation...
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Dig deeper into 2-3 components and explain in detail how they work. For example, how well does each component scale? Any relevant algorithm or data structure you like to use for a component? Also you could draw a diagram using the diagramming tool to enhance your design...
The User Management Service is responsible for managing user accounts, authentication, and authorization. It ensures secure access by validating user credentials (e.g., using hashed passwords) and generating authentication tokens (e.g., JWT). When a user registers, the service verifies the input, stores credentials securely, and initializes user-specific settings. For authorization, it checks permissions and roles to grant or deny access to files or folders.
Implementation Example (Password Hashing):
python
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from bcrypt import hashpw, gensalt
def hash_password(password):
return hashpw(password.encode(), gensalt())
The File Metadata Service tracks information about files and folders, such as their size, version history, and location. When a user uploads a file, this service generates a unique file ID, splits the file into chunks, and assigns storage nodes for each chunk. It also records details like the owner, permissions, and timestamps.
Implementation Example (Metadata Storage):
python
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class MetadataStore:
def init(self):
self.metadata = {}
def add_file(self, file_id, metadata):
self.metadata[file_id] = metadata
def get_file(self, file_id):
return self.metadata.get(file_id)
The Storage Service stores the actual file data by splitting files into chunks and distributing them across multiple storage nodes. Each chunk is replicated to ensure durability. When retrieving a file, the service reassembles the file from its chunks.
Implementation Example (Chunk Storage):
python
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class ChunkStore:
def init(self):
self.chunks = {}
def store_chunk(self, chunk_id, data):
self.chunks[chunk_id] = data
def retrieve_chunk(self, chunk_id):
return self.chunks.get(chunk_id)
The Synchronization Service ensures real-time updates across user devices. It monitors changes made to files and folders, tracks sync statuses, and resolves conflicts when simultaneous updates occur.
Implementation Example (Change Tracking):
python
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class ChangeLog:
def init(self):
self.changes = []
def log_change(self, file_id, change_type):
self.changes.append({"file_id": file_id, "type": change_type})
The Notification Service alerts users about events like shared file activity, sync conflicts, or completed uploads. It supports real-time notifications as well as batched updates.
Implementation Example (Notification Queue):
python
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from queue import PriorityQueue
class NotificationQueue:
def init(self):
self.queue = PriorityQueue()
def add_notification(self, priority, message):
self.queue.put((priority, message))
def get_notification(self):
return self.queue.get()
Explain any trade offs you have made and why you made certain tech choices...
Try to discuss as many failure scenarios/bottlenecks as possible.
Node Failures:
Sync Conflicts:
Metadata Overload:
Network Partitions:
Delayed Notifications:
What are some future improvements you would make? How would you mitigate the failure scenario(s) you described above?
Erasure Coding:
Predictive Scaling:
Advanced Search and Indexing:
Geo-Replication:
Self-Healing System: