feat: broadcast aggregators only once per executor

[tchow-zlai]

Summary

Checklist

• Added Unit Tests
• Covered by existing CI
• Integration tested
• Documentation update

Summary by CodeRabbit

• Performance Improvements

  • Enhanced processing efficiency by broadcasting key aggregator components during group-by operations.

• Chores

  • Added new class registrations to improve serialization during data processing.

[coderabbitai]

Walkthrough

The update broadens broadcasting of SawtoothAggregator, SawtoothMutationAggregator, and HopsAggregator instances across multiple GroupBy methods, replacing local aggregators with broadcast variables. It also adds explicit Kryo registrations for these aggregator classes using JavaSerializer in ChrononKryoRegistrator. No signature or behavior changes occur.

Changes

File(s)	Change Summary
spark/src/main/scala/ai/chronon/spark/GroupBy.scala	Broadcasts SawtoothAggregator, SawtoothMutationAggregator, and HopsAggregator in snapshotEventsBase, temporalEntities, temporalEvents, and hopsAggregate.
spark/src/main/scala/ai/chronon/spark/submission/ChrononKryoRegistrator.scala	Registers SawtoothAggregator, SawtoothMutationAggregator, and HopsAggregator with Kryo using JavaSerializer in doRegister.

Suggested reviewers

• varant-zlai
• piyush-zlai

Poem

📡 Broadcasts soar through Spark’s domain,
Aggregators shared, no work in vain.
Kryo knows them, now registered right,
Serialization’s shining light.
Code refined with care and grace,
Distributed wins the race! 🚀

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro (Legacy)

📥 Commits

Reviewing files that changed from the base of the PR and between 4bf9abd and 56399a7.

📒 Files selected for processing (2)

• spark/src/main/scala/ai/chronon/spark/GroupBy.scala (6 hunks)
• spark/src/main/scala/ai/chronon/spark/submission/ChrononKryoRegistrator.scala (3 hunks)

🚧 Files skipped from review as they are similar to previous changes (2)

• spark/src/main/scala/ai/chronon/spark/submission/ChrononKryoRegistrator.scala
• spark/src/main/scala/ai/chronon/spark/GroupBy.scala

⏰ Context from checks skipped due to timeout of 90000ms (8)

• GitHub Check: streaming_tests
• GitHub Check: join_tests
• GitHub Check: groupby_tests
• GitHub Check: analyzer_tests
• GitHub Check: batch_tests
• GitHub Check: spark_tests
• GitHub Check: fetcher_tests
• GitHub Check: enforce_triggered_workflows

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