[GitHub] [beam] psolomin opened a new issue, #26258: [Task]: Implement dynamic scaling for KinesisIO EFO consumer

["psolomin (via GitHub)" <gi...@apache.org>]

psolomin opened a new issue, #26258:
URL: https://github.com/apache/beam/issues/26258

   ### What needs to happen?
   
   Current version of KinesisIO EFO consumer can not adapt to data skew in Kinesis shards. Moreover, when consuming from a stream which experiences often re-sharding, some runner workers may end up having 0 subscriptions.
   
   Non-EFO consumer has implementation of `getSplitBacklogBytes()` which runners can use for dynamic scaling:
   
   https://github.com/apache/beam/blob/cd0f44b3751c9d4b583b2a3e2e1d10aeb75695b9/sdks/java/io/amazon-web-services2/src/main/java/org/apache/beam/sdk/io/aws2/kinesis/KinesisReader.java#L161
   
   `EFOKinesisReader` should implement a similar mechanism, too:
   
   https://github.com/apache/beam/blob/cd0f44b3751c9d4b583b2a3e2e1d10aeb75695b9/sdks/java/io/amazon-web-services2/src/main/java/org/apache/beam/sdk/io/aws2/kinesis/EFOKinesisReader.java#L31
   
   
   ### Issue Priority
   
   Priority: 3 (nice-to-have improvement)
   
   ### Issue Components
   
   - [ ] Component: Python SDK
   - [X] Component: Java SDK
   - [ ] Component: Go SDK
   - [ ] Component: Typescript SDK
   - [X] Component: IO connector
   - [ ] Component: Beam examples
   - [ ] Component: Beam playground
   - [ ] Component: Beam katas
   - [ ] Component: Website
   - [ ] Component: Spark Runner
   - [ ] Component: Flink Runner
   - [ ] Component: Samza Runner
   - [ ] Component: Twister2 Runner
   - [ ] Component: Hazelcast Jet Runner
   - [ ] Component: Google Cloud Dataflow Runner


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