[Java] Improve GroupIntoBatches display data to show batching parameters

[scwhittle]

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Summary of Changes

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This pull request improves the observability of the GroupIntoBatches transform by integrating its key batching parameters into the display data. This enhancement allows users to easily inspect the configured batch size, byte size, and buffering duration, providing better insight into how the transform is processing data within a Beam pipeline.

Highlights

• Enhanced Display Data: The GroupIntoBatches transform now exposes its batching configuration, including batchSize, batchSizeBytes, and maxBufferingDuration, through the populateDisplayData method.

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Changelog

• sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/GroupIntoBatches.java
  • Added an import for org.apache.beam.sdk.transforms.display.DisplayData.
  • Implemented the populateDisplayData method to register batchSize, batchSizeBytes, and maxBufferingDuration with the display data builder, conditionally adding them if they are not at their default maximum values or zero duration.

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[github-actions]

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R: @Abacn for label java.

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[Abacn]

Thanks!

[scwhittle]

@reuvenlax mentioned that this needs to be on ParDo for Dataflow to use it so I will move it to the ParDo

[scwhittle]

Moved to ParDo and also added to the dataflow batch override of GroupIntoBatches