Anthropic Software Engineer System Design Questions

Background: Anthropic requires a scalable file storage system to efficiently manage user files in a way that supports key operations like storing, retrieving, filtering, backing up, and restoring files. This is crucial for data management across various applications.Requirements:
1. Implement set(file: str, data: bytes) -> None to store a file.
2. Implement get(file: str) -> Optional[bytes] to retrieve file data by name.
3. Implement filter(criteria: Callable[[str], bool]) -> List[str] to return a list of files matching certain conditions.
4. Implement backup(destination: str) -> None to backup all files to a specified location.
5. Implement restore(source: str) -> None to restore files from a backup location.Class API:

• set(file: str, data: bytes) -> None: Stores the file file with the content data in bytes.


• get(file: str) -> Optional[bytes]: Returns the content of the file if it exists, otherwise returns None.


• filter(criteria: Callable[[str], bool]) -> List[str]: Returns a list of file names that match the given criteria.


• backup(destination: str) -> None: Backs up the current files to the specified destination.


• restore(source: str) -> None: Restores files from a backup source.

Example 1:
Input:

• set('document.txt', b'This is a document.')


• set('image.png', b'Image data here.')

Output:

• get('document.txt') returns b'This is a document.'


• filter(lambda x: x.endswith('.png')) returns ['image.png']

Explanation: The method set is used to store files and get retrieves the content of a specific file. The filter method uses a lambda function to find files with the .png extension.Example 2:
Input:

• backup('/backup/location')


• restore('/backup/location')

Output: No direct output, but files are backed up and restored as needed.Constraints:

• Maximum number of files: 1000


• File name length: up to 255 characters.


• Data size: up to 1MB per file.