dlp.risk_test: test_k_map_estimate_analysis_multiple_field failed

[flaky-bot]

Note: #3673 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: d671543
buildURL: Build Status, Sponge
status: failed

Test output

Traceback (most recent call last):
  File "/workspace/dlp/risk_test.py", line 331, in test_k_map_estimate_analysis_multiple_field
    ["AGE", "GENDER"],
  File "/workspace/dlp/risk.py", line 661, in k_map_estimate_analysis
    subscription.result(timeout=timeout)
  File "/workspace/dlp/.nox/py-3-7/lib/python3.7/site-packages/google/cloud/pubsub_v1/futures.py", line 102, in result
    err = self.exception(timeout=timeout)
  File "/workspace/dlp/.nox/py-3-7/lib/python3.7/site-packages/google/cloud/pubsub_v1/futures.py", line 122, in exception
    raise exceptions.TimeoutError("Timed out waiting for result.")
concurrent.futures._base.TimeoutError: Timed out waiting for result.

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (d671543), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).