Large file reading challenge

Welcome in the recruitment challenge. Write an application that, at the endpoint specified by you, returns the yearly average temperatures for a given city in the format array of objects with the following fields: year, averageTemperature.

Assumptions

CSV file with data is no less than 3GB in size.
The file represents temperature measurements in the format city;yyyy-mm-dd HH:mm:ss.SSS;temp
The content of the source file may change during the application's running

Example source file

example_file.csv

Response

Schema

response_schema

Example

[
    {
        "year": "2021",
        "averageTemperature": 12.1
    },
    {
        "year": "2022",
        "averageTemperature": 11.1
    },
    {
        "year": "2023",
        "averageTemperature": 14.1
    }
]

Configuration

property	description	default
data.file-url	path to file with temperatures	data/temperatures.csv

Usage

Temperature statistics endpoint: /api/temperatures/{city} Returns HTTP 200 when city is found, 404 otherwise.

1.2 KiB Raw Blame History