Creating a load job in a project other than the client's project results in error

[tchang-f5]

The following code

    bq_client = bigquery.Client("project_A")
    job = bq_client.load_table_from_json(data, table, job_config=job_config, project="project_B")

would give the error 400 "Value project_B in content does not agree with value project_A. This can happen when a value set through a parameter is inconsistent with a value set in the request."

It seems the upload URL is always set to the client's project.

python-bigquery/google/cloud/bigquery/client.py

Line 2594 in 80944f0

upload_url = _MULTIPART_URL_TEMPLATE.format(project=self.project)

[plamut]

I can confirm the reported behavior. The load_table_from_file() receives the target project name, sets it on the job, but then the _do_multipart_upload() indeed just uses the project configured by the client in the URL. Ditto for resumable uploads.

Thanks for catching and reporting that!