corvin-quodai opened a new pull request #12142: URL: https://github.com/apache/beam/pull/12142
Depending on runner and the mongo collection to read, the bundle size can fall below 1mb which resulted in Source Bundles with weight=0. This lead to a zero division error (raised from [here](https://github.com/apache/beam/blob/23d0c474576e5e58a62a17443587bbd1e9d7e5c3/sdks/python/apache_beam/io/concat_source.py#L154) since the `total` becomes 0). Moving the application of the lower bound to before the source bundle creation makes sure the source bundle size does not become zero. ------------------------ 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. 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