Chenzo1001 opened a new issue, #35780:
URL: https://github.com/apache/beam/issues/35780
### What would you like to happen?
## Background
Currently, when using `apache_beam.yaml` to parse and validate YAML
pipelines, transforms such as `ReadFromCsv` or other IO-related transforms may
attempt to access real files or data sources during pipeline construction or
parameter validation. This leads to errors like `FileNotFoundError`, even if
the user only wants to check the syntax, structure, and transform parameter
correctness of the YAML file, not actually run any data processing.
## Problem
This behavior prevents users and tools from performing lightweight
validation ("validate-only" or "dry-run") of YAML pipelines. It is especially
problematic for CI, code review, or plugin scenarios where users want to:
- Check for YAML syntax correctness
- Validate required fields and config types for transforms
- Ensure wiring of inputs/outputs is correct
- But do **not** want to require the presence of real data files, databases,
or external services
Currently, there is no official API or option to trigger a validate-only
mode that avoids all IO/data access.
## Proposal
- Add an official `validate_only` or `dry_run` mode/flag to YAML pipeline
parsing and transform construction.
- In this mode, all IO/data transforms should **not** attempt to access or
glob real files, open network/database connections, or perform any side effects.
- Only the transform schema, parameters, input/output structure, and wiring
should be checked.
- Ideally, this should be available both via the Python API and the CLI.
## Impact
- This would greatly improve the developer experience for YAML/Beam users.
- It would enable safer CI/linting, better code review automation, and more
robust plugin development.
- It would prevent false negatives and usability issues for users who only
want to check pipeline structure.
## Example
```python
# Current (undesired):
# Raises FileNotFoundError if /fake/path.csv doesn't exist
options, constructor = build_pipeline_components_from_yaml(yaml_str, [],
validate_schema='per_transform')
# Desired:
options, constructor = build_pipeline_components_from_yaml(yaml_str, [],
validate_schema='per_transform', validate_only=True) # No IO attempted
```
Please consider this feature to improve YAML pipeline validation usability!
### Issue Priority
Priority: 2 (default / most feature requests should be filed as P2)
### Issue Components
- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [x] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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