What This Category of Data Looks Like
Reference only; verify against the target FastGPT release and deployment documentation.
Constraints on Document Parsing and Chunking
Mixed document formats require the parsing module to support multiple file types, to avoid content loss from single-format parsing. Complex multi-row material tables in Excel require chunking logic that preserves cell and value associations, otherwise subsequent file review verification cannot be supported. Long documents (single feasibility study reports can be hundreds of pages) require reasonable control of chunk granularity, to avoid splitting technical terms and associated data. Professional measurement fields need to retain the binding between original units and values, otherwise parameter verification during review will be affected. Additionally, the review scenario requires chunk results to be traceable to specific locations in the original document, so metadata must be bound during chunking.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Adapts to the length of single chapter content in coal chemical industry feasibility study reports, avoids splitting technical terms and associated data |
chunkSplitter | Split by header, footer, and paragraph | Filters repeated header and footer information in declaration materials, retains core business paragraphs and table structures |
customPdfParse | Enable structured parsing | Adapts to PDF-format environmental assessment reports and acceptance opinions, retains hierarchical relationships between tables and text |
PARSE_FILE_TIMEOUT_SECONDS | 600 seconds | Covers parsing time for single large feasibility study reports, avoids interrupting the parsing process due to timeout |
UPLOAD_FILE_MAX_SIZE | 1000 MB | Supports batch uploading of single large project declaration documents, meets the full material submission requirements of coal chemical industry projects |
chunkSettingMode | Manual configuration | Adapts to the professional structure of coal chemical industry documents, avoids damaging business associations from generic chunking |
Three Common Mistakes
- Phenomenon: The error "the argument ‘windows-1252’ is invalid encoding" appears when uploading PDF or PPT documents. Cause: Encoding adaptation parameters for
customPdfParseare not configured. Traditional chemical terms frequently appearing in coal chemical documents or encoding formats of older documents are not recognized. - Phenomenon: After uploading an Excel material balance sheet, chunk results lose cell associations for multi-row tables, only retaining scattered text. Cause:
chunkSplitteris not configured to split by table boundaries, and the default character-by-character splitting logic is used. - Phenomenon: Retrieval return results cannot be linked to specific page numbers or chapters of the original document. Cause: Document traceability configuration is not enabled, and the binding relationship between document metadata and chunked content is not retained during chunking.
How to Verify Correct Configuration
- Upload a single coal chemical industry feasibility study report with more than 100 pages, check if a complete chunk list is generated after parsing, with no timeout errors.
- Upload an Excel material sheet containing multi-row tables, check if the chunk results retain the table's row and column structure and cell values.
- Trigger a retrieval, check if the return results include the file name and chapter information of the original document.
- Test uploading a single declaration document larger than 500 MB, confirm that the upload and parsing processes are not interrupted.
The values listed here are common starting points, and should be evaluated against relevant 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.