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samples(test): flaky sync pull test #434

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plamut merged 2 commits into from
Jun 23, 2021
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samples(test): flaky sync pull test #434

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samples(test): flaky sync pull test
anguillanneuf Jun 23, 2021
3229a80
address peter's comment
anguillanneuf Jun 23, 2021
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9 changes: 8 additions & 1 deletion samples/snippets/subscriber_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
import os
import re
import sys
import time
import uuid

import backoff
Expand Down Expand Up @@ -475,7 +476,13 @@ def test_receive_synchronously_with_lease(
):
@backoff.on_exception(backoff.expo, Unknown, max_time=300)
def run_sample():
_publish_messages(publisher_client, topic, message_num=3)
_publish_messages(publisher_client, topic, message_num=10)
# Pausing 10s to allow the subscriber to establish the connection
# because sync pull often returns fewer messages than requested.
# The intention is to fix flaky tests reporting errors like
# `google.api_core.exceptions.Unknown: None Stream removed` as
# in https://github.com/googleapis/python-pubsub/issues/341.
time.sleep(10)
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@plamut plamut Jun 23, 2021 •
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Maybe add a comment why this is needed?

Waiting for a fixed amount of time is of course far from ideal, but if it resolves or at least significantly mitigates the flakiness, it's fine to have it, as flakiness has really been getting into the way recently.

Edit: Whoa, samples tests passed on the first attempt. Could be a coincidence, of course, but it's a good start nevertheless. 🙂

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@anguillanneuf anguillanneuf Jun 23, 2021

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Added a comment. Please take a look now to see if it's sufficient.

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@plamut plamut Jun 23, 2021

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Looks good, thanks!

subscriber.synchronous_pull_with_lease_management(PROJECT_ID, SUBSCRIPTION_SYNC)

run_sample()
Expand Down