sgraca opened a new pull request #11377: [BEAM-9439] Return split instead of total backlog size URL: https://github.com/apache/beam/pull/11377 This merge request changes how backlog bytes are reported by KinesisReader. Instead of total backlog bytes, which could result in Dataflow pipelines not scaling up, split backlog is now reported. The split backlog size can be over-estimated as it reports the size of the records across all shards (and also assumes that all shards in the split have the same progress). This can lead to unnecessary decisions to scale up the number of workers but will never fail to scale up when this is necessary. Also the watermark policy of the reader is user configurable and we don't have a control over it. The calculation of backlog bytes should always take into account the time that the record was inserted into Kinesis as this gives accurate results which are independent of current processing time or any other conditions that reader watermark can be using. Therefore a separate, fixed policy is used to track processed records for the backlog calculation. ------------------------ Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily: - [x] [**Choose reviewer(s)**](https://beam.apache.org/contribute/#make-your-change) and mention them in a comment (`R: @username`). - [x] 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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