The Controller app of the PDF Aggregation Service.

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README.md

UrlsController

The Controller's Application receives requests coming from the Workers , constructs an assignments-list with data received from a database and returns the list to the workers.
Then, it receives the "WorkerReports", it requests the full-texts from the workers, in batches, and uploads them on the S3-Object-Store. Finally, it writes the related reports, along with the updated file-locations into the database.
The database used is the Impala.

Statistics API:

"getNumberOfPayloads" endpoint: http://IP:PORT/api/stats/getNumberOfPayloads
"getNumberOfRecordsInspected" endpoint: http://IP:PORT/api/stats/getNumberOfRecordsInspected

To install and run the application:

Run git clone and then cd UrlsController.
Set the preferable values inside the application.properties file.
Execute the installAndRun.sh script which builds and runs the app.
If you want to just run the app, then run the script with the argument "1": ./installAndRun.sh 1.
If you want to build and run the app on a Docker Container, then run the script with the argument "0" followed by the argument "1": ./installAndRun.sh 0 1.

Implementation notes:

For transferring the full-text files, we use Facebook's Zstandard compression algorithm, which brings very big benefits in compression rate and speed.
The names of the uploaded full-text files ae of the following form: "datasourceID/recordId::fileHash.pdf"