Debug detect_test.py::test_async_detect_document failure

[tmatsuo]

In #3751 we disabled detect_test.py::test_async_detect_document in vision/cloud-client/detect directory.

It constantly timing out with LRO.

Debug it and re-enable it if possible.

[tmatsuo]

The test is using a PDF file:
gs://cloud-samples-data/vision/document/custom_0773375000.pdf

The file size is 4.8MB. I'm experimenting with a smaller file.

[tmatsuo]

It also times out with a smaller file. I also explicitly added ObjectCreator role on the bucket, but no success.

I'm asking vision API devs for help.

[tmatsuo]

For the record, it even fails with 3600 seconds timeout.

[detinho]

It seems to be a backend issue. I have been using this same operation in production via the Java SDK for a long time and today a customer complained. I noted a 100% error rate on this operation for the past 48 hours.
I opened a case on GCP console and for all the tests we (the support guy and me) did (even via the REST API directly) the operation never finishes.
Our files are all 1 page PDFs and small files, ranging from 15kb to 250kb avg.

[tmatsuo]

@detinho Thanks for your input and sorry for the trouble. We're working on the fix.