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fix(preprocessing): prevent duplicate pages on resume and track byte offset in checkpoint - #182
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…offset in checkpoint - Store file_offset alongside pages_processed in checkpoint metadata - Truncate output file to checkpoint file_offset before appending on resume to discard partial uncommitted writes - Store SHA-256 hash instead of Path object in input_identity so identity checks pass on resume - Add regression tests covering output truncation on resume and fallback on invalid checkpoints Closes AOSSIE-Org#76
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📝 WalkthroughWalkthroughXML extraction checkpoints now include the output byte offset. On resume, extraction truncates output to the saved offset before continuing. Periodic and failure checkpoints record the current offset and input identity. ChangesXML extraction resume
Estimated code review effort: 2 (Simple) | ~15 minutes Change: Bug fix · Severity of issue fixed: High 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
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- 🪄 Fix CodeRabbit comments on this PR
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Review comments at @Legacy/openverifiablellm/utils.py:
- Around line 370-372: In the output-writing flow, capture and retain the latest
valid output offset while `out` is open; update both exception handlers to save
that checkpoint instead of calling `tell()` on a closed stream. If no new offset
was captured, preserve the previous valid checkpoint alongside `pages_written`.
- Line 213: Update checkpoint-resume handling around `file_offset` to require
that the saved offset is present and has an integer type that excludes booleans;
if it is missing or invalid, start fresh instead of resuming or truncating
output.
- Around line 229-230: Before resuming from the checkpoint, verify the committed
output prefix using a stored digest, not only its size. If the prefix digest
differs, discard the checkpoint and start fresh; retain the existing size
validation for the output_path and file_offset checks.
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Legacy/openverifiablellm/utils.pyLegacy/tests/test_util.py
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…refix digest validation
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pushed the updates for coderabbit. wrapped the stream writer with in-stream exception handling so out is flushed and tell() captures the exact offset while the file stream is still open, rather than attempting to inspect a closed stream. also enforced strict int type checks excluding booleans for file_offset and pages_processed, and added output prefix sha256 validation so any modified output prefix triggers a clean fresh restart. added regression tests for the boolean/hash mismatch paths and exception offset persistence, all 26 tests passing green. |
closes #76
when preprocessing xml dumps, pages are written continuously to wiki_clean.txt while checkpoints are saved periodically every 1000 pages. if an interruption or crash happens between checkpoint intervals, extra pages were already appended to the output file. on resume, because start_page resumed from the checkpoint but the output was simply opened in append mode, those intermediate pages got appended again, creating duplicated text and corrupting downstream hashes and merkle roots. on top of that, _save_checkpoint was passing input_path as a Path object instead of its sha256 digest, which caused _load_checkpoint to always fail identity validation and wipe progress.
this PR tracks file_offset alongside pages_processed in the checkpoint metadata and handles clean recovery. it records out.tell() whenever checkpoint writes occur (both periodically and on clean exception exit). on resume, it safely validates the input identity and truncates the existing output file to file_offset using r+b before reopening in append mode, discarding any uncommitted trailing writes from crashes. it also properly stores the sha256 hash in input_identity so valid checkpoints actually resume rather than falling back to fresh runs, while gracefully restarting fresh if the checkpoint or output file is missing, modified, or corrupted.
added regression tests in Legacy/tests/test_util.py covering offset truncation with duplicate prevention and invalid checkpoint fallback handling. verified with pytest, 24/24 passing.
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