KevinGG opened a new pull request #11174: [BEAM-7923] Pop failed transform in CombineGlobally URL: https://github.com/apache/beam/pull/11174 1. The problem: when the CombineGlobally raises the ValueError, it breaks out the process of transform `apply` where the current transform has been pushed into a transform stack, to be expanded and then popped out in the end. Without the popping out, the pipeline will hold a current transform that is referring the failed CombineGlobally transform and never changes, meaning the pipeline will not accept any new transforms after. 2. It did not affect non-interactive usages because when the pipeline construction runs into an error, the user has to restart the whole program and nothing has been executed at the point the error is raised, so no side-effects. 3. It did leave the pipeline in a dead state when the user constructs pipelines in an interactive environment. 4. The pop before raising the error allows the transform stack to recover from the failed state. **Please** add a meaningful description for your change here ------------------------ Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily: - [ ] [**Choose reviewer(s)**](https://beam.apache.org/contribute/#make-your-change) and mention them in a comment (`R: @username`). - [ ] Format the pull request title like `[BEAM-XXX] Fixes bug in ApproximateQuantiles`, where you replace `BEAM-XXX` with the appropriate JIRA issue, if applicable. This will automatically link the pull request to the issue. - [ ] Update `CHANGES.md` with noteworthy changes. - [ ] If this contribution is large, please file an Apache [Individual Contributor License Agreement](https://www.apache.org/licenses/icla.pdf). See the [Contributor Guide](https://beam.apache.org/contribute) for more tips on [how to make review process smoother](https://beam.apache.org/contribute/#make-reviewers-job-easier). 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