What data for this category looks like
Policy and regulatory basis documents for the grain reserve sector primarily come from normative documents, industry management standards, reserve grain rotation and quality inspection rules issued by the national grain and material reserve authority and provincial, municipal grain and material reserve departments. Update frequency is irregular for policy revisions, while local implementation details are updated every quarter to semi-annually. Most documents have structures including document numbers, issuing units, effective dates, chapters and clauses, attached tables and other elements. Fields include quantitative indicators such as reserve volume and rotation cycle, with units including tons, kilograms, days, yuan/ton and others. Some older policies are in scanned document format, with layout offset issues.
What constraints do these characteristics impose on the document parsing and chunking step?
Document sources include official documents and scanned copies, so the parsing link must support OCR recognition of scanned content to avoid losing text information from older policies. Documents have clear hierarchies and metadata, so chunking must retain key information such as document numbers and effective dates, and must not mix metadata into main text chunks. There are many quantitative indicators and attached tables, so chunking rules must support complete extraction of table content, and avoid splitting table cells which causes data confusion. Some documents have large file sizes, so the parsing link must support large file uploads and long-running tasks to avoid mid-task termination.
How to set the configuration
Reference only; verify against the target FastGPT release and deployment documentation.
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Single clauses in grain policy documents are mostly 300-800 words. This range avoids splitting the same clause, while ensuring context relevance |
chunkSplitter | Split by title hierarchy + paragraphs | Policy documents have clear chapter, section and clause hierarchies. Retaining hierarchies enables more accurate question-answering matching |
customPdfParse | Enabled | Official policy documents often have document numbers and release dates in headers and footers. Enabling this extracts metadata to avoid mixing it into chunked content, and also supports OCR parsing of images within PDFs |
PARSE_FILE_TIMEOUT_SECONDS | 600 seconds | Large policy compilation PDFs may exceed 500 pages, with long parsing times. The default duration is insufficient for complete parsing |
UPLOAD_FILE_MAX_SIZE | 2000 MB | Policy compilation packaged files from some local grain reserve departments have large sizes, so upload limits must be accommodated |
Three common errors
- Phenomenon: After migrating a knowledge base, chunking results are completely different from the original library. Cause: The original server's
chunkSplitterandchunkSizeconfigurations were not retained, and default parameters were used directly to generate new chunks. - Phenomenon: Uploading a PDF containing grain depot site photos or policy attachment charts results in no image-related text content after parsing. Cause: The image OCR parsing switch for
customPdfParsewas not enabled, and only plain text content was extracted. - Phenomenon: Parsing a policy compilation file with more than 300 pages leads to automatic termination of the parsing task. Cause: The value set for
PARSE_FILE_TIMEOUT_SECONDSis shorter than the actual required parsing time, orUPLOAD_FILE_MAX_SIZEdoes not accommodate large file upload limits.
How to confirm the configuration is properly set
- Upload a local grain reserve policy PDF with fewer than 10 pages, and check if parsed chunks retain metadata such as document number and release date.
- Adjust
chunkSizeto 800 characters, upload a text segment containing 3 consecutive policy clauses, and confirm that chunks do not split the same clause. - Upload a PDF with a high-quality grain depot quality inspection photo, and confirm that parsed results include OCR text corresponding to the photo.
- Upload a 1.2 GB policy compilation compressed package, and confirm that the upload succeeds and the parsing task does not time out.
The values provided here are common starting points, and should be evaluated against the reader's own samples.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-28.