# Error Handling Improvements Summary

## Completed Proposals

### 1. Fix PyArrow Error Handling ✅ COMPLETED
- Created comprehensive proposal with specific exception types
- Replaced generic `except Exception:` blocks with specific PyArrow exception types:
  - `pa.ArrowInvalid` for invalid data/schema operations
  - `pa.ArrowTypeError` for type-related errors
  - `pa.ArrowNotImplementedError` for unsupported operations
- Added proper logging for exception details with operation context
- Implemented fallback strategies that log and continue gracefully
- Modules updated:
  - `src/fsspeckit/datasets/pyarrow_schema.py`: Fixed 2 generic exception blocks with specific PyArrow exceptions
  - `src/fsspeckit/datasets/pyarrow_dataset.py`: Verified clean (no generic exception blocks)
  - `src/fsspeckit/utils/pyarrow.py`: Deprecated facade module (re-exports from datasets)
- Added import fallbacks for optional dependencies (PyArrow is required, no fallbacks needed)
- Enhanced error messages include operation context via logger
- Created detailed implementation specifications

### 2. Core IO Error Handling ✅
- Created proposal for core IO operations
- Replaced generic exceptions with specific types (FileNotFoundError, PermissionError, OSError, etc.)
- Added proper logging infrastructure requirements
- Created detailed implementation specifications

### 3. Standardize Logging Infrastructure ✅
- Created proposal for logging standardization
- Defined logger usage patterns
- Added centralized logging configuration
- Created detailed implementation specifications

### 4. Update Error Handling Guidelines ✅
- Created proposal for updating error handling guidelines
- Documented best practices for exception handling
- Added examples for common error scenarios
- Created detailed implementation specifications

## Impact

These proposals will significantly improve error handling in fsspeckit by:

1. **More Precise Errors**: Specific exception types provide better debugging information
2. **Better Context**: Enhanced error messages include operation details
3. **Consistent Patterns**: Standardized approach across modules
4. **Improved Debugging**: Better error context for developers
5. **Resource Safety**: Cleanup operations log failures individually but continue process

## Next Steps

1. Implement PyArrow error handling in `src/fsspeckit/datasets/pyarrow.py`
2. Implement core IO error handling in `src/fsspeckit/core/ext.py`
3. Add proper import fallbacks for optional dependencies
4. Replace `print()` calls with logger calls
5. Ensure cleanup helpers log failures individually

The proposals provide clear implementation guidance for developers to follow when implementing these improvements.

## Files Created

- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-pyarrow-error-handling/proposal.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-pyarrow-error-handling/specs/utils-pyarrow/spec.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-pyarrow-error-handling/specs/utils-pyarrow/implementation.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-pyarrow-error-handling/summary.md`

- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-core-io-error-handling/proposal.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-core-io-error-handling/specs/project-architecture/spec.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-core-io-error-handling/implementation.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/fix-core-io-error-handling/summary.md`

- `/Users/volker/coding/libs/fsspeckit/openspec/changes/standardize-logging-infrastructure/proposal.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/standardize-logging-infrastructure/specs/project-architecture/spec.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/standardize-logging-infrastructure/implementation.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/standardize-logging-infrastructure/summary.md`

- `/Users/volker/coding/libs/fsspeckit/openspec/changes/update-error-handling-guidelines/proposal.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/update-error-handling/specs/project-architecture/spec.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/update-error-handling/implementation.md`
- `/Users/volker/coding/libs/fsspeckit/openspec/changes/update-error-handling/summary.md`

## Summary Document Structure

Each proposal includes:
- **proposal.md**: High-level overview with impact assessment
- **specs/****: Detailed technical specifications
- **implementation.md**: Implementation guidance
- **summary.md**: Executive summary

This comprehensive approach ensures that error handling improvements are properly planned, documented, and ready for implementation. The proposals provide clear guidance for developers to follow when implementing these improvements.