mosche opened a new issue, #25761: URL: https://github.com/apache/beam/issues/25761
### What would you like to happen? Beam runners may choose to apply optimizations to a pipeline before it is executed. A key optimization, fusion, relates to [ParDo](https://beam.apache.org/releases/javadoc/2.0.0/org/apache/beam/sdk/transforms/ParDo.html) operations. If one [ParDo](https://beam.apache.org/releases/javadoc/2.0.0/org/apache/beam/sdk/transforms/ParDo.html) operation produces a [PCollection](https://beam.apache.org/releases/javadoc/2.0.0/org/apache/beam/sdk/values/PCollection.html) that is then consumed as the main input of another [ParDo](https://beam.apache.org/releases/javadoc/2.0.0/org/apache/beam/sdk/transforms/ParDo.html) operation, the two [ParDo](https://beam.apache.org/releases/javadoc/2.0.0/org/apache/beam/sdk/transforms/ParDo.html) operations will be fused together into a single ParDo operation and run in a single pass; this is "producer-consumer fusion". ### Issue Priority Priority: 3 (nice-to-have improvement) ### Issue Components - [ ] Component: Python SDK - [ ] Component: Java SDK - [ ] Component: Go SDK - [ ] Component: Typescript SDK - [ ] Component: IO connector - [ ] Component: Beam examples - [ ] Component: Beam playground - [ ] Component: Beam katas - [ ] Component: Website - [X] Component: Spark Runner - [ ] Component: Flink Runner - [ ] Component: Samza Runner - [ ] Component: Twister2 Runner - [ ] Component: Hazelcast Jet Runner - [ ] Component: Google Cloud Dataflow Runner -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
