gemini-code-assist[bot] commented on PR #37488:
URL: https://github.com/apache/beam/pull/37488#issuecomment-3839413501
## Summary of Changes
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reviewing this pull request and will post my feedback shortly. In the meantime,
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This pull request standardizes the dependency loading mechanism for cloud
storage filesystems within Apache Beam. By making the GCS filesystem lookup
lazy, it ensures that the necessary GCP dependencies are only validated and
loaded when GCS operations are actually performed, rather than at the initial
filesystem object retrieval. This change improves consistency with the existing
S3 filesystem behavior and provides a more robust and user-friendly experience
by deferring dependency-related errors to the point of usage.
### Highlights
* **Lazy GCS Dependency Loading**: The GCS filesystem now defers the import
of GCP dependencies (apache-beam[gcp]) until an actual GCS operation is
attempted, aligning its behavior with S3.
* **Consistent Error Handling**: FileSystems.get_filesystem() for gs://
paths will no longer raise a ValueError immediately if GCP dependencies are
missing; instead, ImportError will be raised only when GCS functionality is
used.
* **New Regression Test**: A unit test has been added to specifically verify
that FileSystems.get_filesystem("gs://...") succeeds without requiring
apache-beam[gcp] to be installed.
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<details>
<summary><b>Changelog</b></summary>
*
**examples/java/src/main/java/org/apache/beam/examples/cookbook/TriggerExample.java**
* Modified the BigQueryIO.writeTableRows() configuration to explicitly
use withWriteDisposition(BigQueryIO.Write.WriteDisposition.WRITE_APPEND).
* **sdks/python/apache_beam/io/gcp/gcsfilesystem.py**
* Implemented a _get_gcsio method to encapsulate the gcsio import,
making it lazy and raising an ImportError if apache-beam[gcp] is not present.
* Converted CHUNK_SIZE into a property that dynamically retrieves its
value via _get_gcsio, ensuring lazy initialization.
* Updated all internal methods (_gcsIO, report_lineage) to utilize the
new lazy _get_gcsio helper.
* **sdks/python/apache_beam/io/gcp/gcsfilesystem_test.py**
* Introduced GCSFileSystemLazyLoadTest to specifically test the lazy
loading behavior of get_filesystem for GCS paths.
* Refactored existing GCS filesystem tests to mock the _get_gcsio
method, adapting them to the new lazy dependency loading architecture.
</details>
<details>
<summary><b>Activity</b></summary>
* The pull request was created by RushabhRatnaparkhi.
* It addresses issue #37445.
* A unit test was added to confirm that
FileSystems.get_filesystem("gs://...") works without apache-beam[gcp] installed.
* Manual verification was performed to ensure GCP dependency errors are
raised only when GCS operations (like open) are invoked, not during initial
lookup.
</details>
<details>
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