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fix: avoid blocking in download thread when using BQ Storage API #2034

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fix: avoid blocking in download thread when using BQ Storage API #2034

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kien-truong
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This prevents a deadlock between the main thead and download threads when the threadpool is shutdown prematurely.

Fixes #2032 🦕

@kien-truong kien-truong requested review from a team as code owners September 28, 2024 03:14
@product-auto-label product-auto-label bot added size: s Pull request size is small. api: bigquery Issues related to the googleapis/python-bigquery API. labels Sep 28, 2024
@Linchin Linchin added the kokoro:force-run Add this label to force Kokoro to re-run the tests. label Oct 3, 2024
@Linchin Linchin self-assigned this Oct 3, 2024
@yoshi-kokoro yoshi-kokoro removed the kokoro:force-run Add this label to force Kokoro to re-run the tests. label Oct 3, 2024
@Linchin Linchin removed their assignment Oct 8, 2024
@kien-truong
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Just dropping by to see if there's any concerns about this PR.

@kien-truong
fix: avoid blocking in download thread when using BQ Storage API
8eebb9d 
This prevents a deadlock between the main thead and download threads
when the threadpool is shutdown prematurely.
@kien-truong kien-truong mentioned this pull request Nov 16, 2024
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@chalmerlowe chalmerlowe added the kokoro:run Add this label to force Kokoro to re-run the tests. label Nov 18, 2024
@yoshi-kokoro yoshi-kokoro removed the kokoro:run Add this label to force Kokoro to re-run the tests. label Nov 18, 2024
@chalmerlowe
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I took a quick look.
Gonna run our CI/CD checks on this.
My first thought is that because we are adding a couple code paths coverage is likely to fail.
Also curious why the pragma for queue.full: we recently got bitten by having a code branch that was not tested and I am hesitant about adding more such paths to the code base without understanding for myself why it is necessary/desireable.

@kien-truong
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The queue.Full code path is hard to test because it's non-deterministic: the queue can be full or not depending on the timing of consumers and producers.

So, I just put a pragma there to ignore the coverage, similar to the existing code a few lines below.

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

Line 968 in aaec3ce

except queue.Empty: # pragma: NO COVER

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@leahecole leahecole Awaiting requested review from leahecole leahecole is a code owner automatically assigned from googleapis/api-bigquery

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Deadlock due to race condition in download thread when using Bigquery Storage API
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@kien-truong @chalmerlowe @hongalex @Linchin @yoshi-kokoro