Plumb custom batch parameters for autosharding from WriteFiles to FileIO.

[celeste-zeng]

• Plumbed withBatchSize(), withBatchSizeBytes(), and withBatchMaxBufferingDuration() from WriteFiles to FileIO.
• Added checks for parameters that should not be set if autosharding is enabled.
• Added a test to check the correctness of plumbing.

[gemini-code-assist]

Summary of Changes

Hello @celeste-zeng, 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 extends the FileIO API in Apache Beam to provide more granular control over file writing operations, particularly for unbounded data streams with automatic sharding. It integrates batching parameters previously exclusive to WriteFiles directly into FileIO, allowing users to specify batch size, batch size in bytes, and maximum buffering duration. Crucially, it also implements robust validation to prevent incompatible sharding configurations, ensuring that auto-sharding and manual sharding parameters are not used simultaneously. These changes enhance the flexibility and correctness of FileIO for advanced use cases.

Highlights

• Batch Parameter Plumbing: Introduced withBatchSize(), withBatchSizeBytes(), and withBatchMaxBufferingDuration() methods to FileIO for configuring batching behavior, mirroring WriteFiles.
• Auto-Sharding Validation: Added validation logic to prevent conflicting sharding configurations, specifically disallowing withNumShards() or withSharding() when withAutoSharding() is enabled, and vice-versa.
• Guava Import Modernization: Updated Guava library imports from the vendored org.apache.beam.vendor.guava package to the direct com.google.common package in FileIO.java and FileIOTest.java.
• New Test Case: A new test testWriteUnboundedWithCustomBatchParameters was added to FileIOTest.java to ensure the correct functionality of custom batch parameters when writing unbounded data with auto-sharding.

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[celeste-zeng]

R: @tomstepp

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[tomstepp]

Thanks! Just a few minor comments.

[tomstepp]

R: @Abacn

For Java and merging when ready.

[Abacn]

please check formatting in https://github.com/apache/beam/actions/runs/21536010689/job/62061776795?pr=37463

[tomstepp]

Commented on extra test case, but otherwise LGTM

[tomstepp]

LGTM, thanks!

@Abacn could you review/merge?