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ib.collect support wait_for_inputs option #37221

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@ian-Liaozy ian-Liaozy commented Jan 5, 2026 •
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Fixes #37220

This PR updates interactive_beam.collect() to correctly handle PCollections that depend on asynchronously running background caching jobs.

Previously, if a user attempted to collect() a PCollection while its upstream dependencies were still being computed/cached by the background RecordingManager, the result could be incomplete or trigger race conditions.

This change introduces a wait_for_inputs parameter (defaulting to True) which ensures that collect() blocks until all necessary upstream dependencies have finished their background computation.

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gemini-code-assist bot commented Jan 5, 2026

Summary of Changes

Hello @ian-Liaozy, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant enhancement to the ib.collect function within Apache Beam's Interactive Runner by adding a wait_for_inputs parameter. This parameter provides users with fine-grained control over how collect handles asynchronous dependencies, allowing them to optimize for either immediate scheduling or guaranteed completion of upstream computations, thereby influencing the execution flow and potential resource utilization of interactive Beam pipelines.

Highlights

  • New wait_for_inputs option for ib.collect: The collect function in interactive_beam.py now accepts a wait_for_inputs boolean parameter, defaulting to True.
  • Control over asynchronous dependencies: This new option allows users to specify whether collect should wait for upstream asynchronous computations to complete before proceeding.
  • Performance implications: Setting wait_for_inputs to False can schedule computations immediately but might lead to redundant pipeline stage executions if dependencies are not yet ready.
  • Comprehensive testing: New unit tests have been added to interactive_beam_test.py to ensure the correct behavior of collect with different wait_for_inputs values.

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@ian-Liaozy ian-Liaozy marked this pull request as ready for review January 14, 2026 18:15
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[Feature Request]: ib.collect support wait_for_inputs option

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