Use 50 workers for 2GB 10 bytes combine test

[liferoad]

python_Combine_Dataflow_Streaming_2GB_10_byte_records.txt failed due to the limited number of workers. Increase this to 50, which should finish the test within 2 hours (~16$).

Tests are here:

beam/sdks/python/apache_beam/testing/load_tests/combine_test.py

Line 121 in 50f33cd

beam.combiners.TopCombineFn(self.top_count)).without_defaults()

Cron:
https://github.com/apache/beam/blob/50f33cd786dc63463688315a1c73b1cf4ef18807/.github/workflows/beam_LoadTests_Python_Combine_Dataflow_Streaming.yml#L20C14-L20C25

Fixes #23904

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI or the workflows README to see a list of phrases to trigger workflows.

[github-actions]

Assigning reviewers. If you would like to opt out of this review, comment assign to next reviewer:

R: @Abacn for label build.

Available commands:

• stop reviewer notifications - opt out of the automated review tooling
• remind me after tests pass - tag the comment author after tests pass
• waiting on author - shift the attention set back to the author (any comment or push by the author will return the attention set to the reviewers)

The PR bot will only process comments in the main thread (not review comments).

[tvalentyn]

Do you think there is some inefficiency? do we need 10x workers for this test in streaming mode or batch and streaming tests are fundamentally different?

[tvalentyn]

is 2GB the total # of bytes processed?

[Abacn]

+1, needs 50 workers to proceed 2 GB data sounds not quite right in general. There must be some underlying issue that actually need to be resolved.

[liferoad]

is 2GB the total # of bytes processed?

Yes. The problem is beam.CombineGlobally(beam.combiners.TopCombineFn(self.top_count)).without_defaults() does the sorting on all (k, v) pairs.

[Abacn]

Can we change the cron string to sth like '50 5 * * *' so the risk of interfering with other workflow is minimum

beam/.github/workflows/beam_LoadTests_Python_Combine_Dataflow_Streaming.yml

Line 20 in 50f33cd

- cron: '50 15 * * *'

[liferoad]

Can we change the cron string to sth like '50 5 * * *' so the risk of interfering with other workflow is minimum

beam/.github/workflows/beam_LoadTests_Python_Combine_Dataflow_Streaming.yml

Line 20 in 50f33cd

- cron: '50 15 * * *'

Good idea. Done. Thanks.

[Abacn]

merge now and let's see how it goes