Usage

This page documents how to run the pipeline locally to complete the task for the dataset for 2020.

The pipeline also runs in GCP using DataFlow and is discussed further on but can be viewed here. We also discuss how to adapt the pipeline so it can run against the full dataset.

Download dataset

The input data by default should go in ./data/input.

For convenience the data is available publicly in a GCP Cloud Storage bucket.

Run:

wget https://storage.googleapis.com/street-group-technical-test-dmot-euw1/input/pp-2020.csv -P data/input

to download the data for 2020 and place in the input directory above.

Entrypoint

The entrypoint to the pipeline is analyse-properties.

Available options

Running

analyse-properties --help

gives the following output:

usage: analyse-properties [-h] [--input INPUT] [--output OUTPUT]

optional arguments:
  -h, --help       show this help message and exit
  --input INPUT    Full path to the input file.
  --output OUTPUT  Full path to the output file without extension.

The default value for input is ./data/input/pp-2020.csv and the default value for output is ./data/output/pp-2020.

If passing in values for input/output these should be full paths to the files. The test will parse these inputs as a str() and pass this to beam.io.ReadFromText().

Run the pipeline

To run the pipeline and complete the task run:

analyse-properties --runner DirectRunner

The pipeline will use the 2020 dataset located in ./data/input and output the resulting .json to ./data/output.