What data for this use case looks like
Data primarily comes from official disclosure documents of railway groups and highway operating entities, as well as monthly and weekly public notices from local transportation authorities. Most documents are in PDF format, containing structured tables and explanatory text. Structured content includes fields such as project section number, total line mileage, financing amount (unit: ten thousand yuan or hundred million yuan), financing term, credit granting bank, and fund arrival node. Update frequency is mostly daily updates for individual project dynamics, with weekly summaries of industry-wide financing conditions.
Constraints imposed on document parsing and chunking
Structured tables make up a large share of document content and often span multiple pages. Complete information for the same project section must not be split. Financing amounts use mixed units of ten thousand yuan and hundred million yuan. Units must be unified after parsing, otherwise data logic will break after chunking. A single document contains multiple independent financing projects, so chunking units must be split by project subject. Cross-page project explanatory text must retain contextual association to ensure that the binding relationship between the project and corresponding parameters is not lost after chunking.
Configuration settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
PARSE_FILE_TIMEOUT_SECONDS | 900 seconds | Documents contain multi-page cross-page tables, with higher parsing time than general scenarios |
UPLOAD_FILE_MAX_SIZE | 200 MB | A single summary financing daily report document may include dozens of projects, resulting in larger file size |
MAX_CHUNK_SIZE | 1200–1500 characters | Accommodate complete details of a single financing project, section information and corresponding explanatory text |
CHUNK_OVERLAP | 100–150 characters | Retain association of table fields across segments, avoid splitting the binding relationship between project sections and financing amounts |
TABLE_PARSE_STRATEGY | Merge complete entries by row | Table rows of railway and highway financing projects contain multiple associated fields, must avoid splitting complete information of a single project |
EMBEDDING_MODEL | bge-large-zh-v1.5 | Adapt to text semantics in the Chinese financial field, improve retrieval accuracy after chunking |
The parameter values provided on this page are conventional recommendations used as a starting point for configuration. Actual values are affected by material form, data volume and business rules. Specific issues require specific analysis, and it is recommended to test on your own samples before finalizing.
Three common errors
- Phenomenon: Parsing times out after uploading a file, and the custom parsing service does not respond. Cause: The
PARSE_FILE_TIMEOUT_SECONDSparameter is not adjusted, and the default timeout period is insufficient to complete parsing of multi-page tables. - Phenomenon: A 413 error is returned when uploading a file. Cause: The
UPLOAD_FILE_MAX_SIZEconfiguration value is smaller than the actual uploaded file size, and the maximum request body limit of the container is not adjusted synchronously when deploying via Docker. - Phenomenon: Project sections and financing amounts are separated in chunking results. Cause: The
MAX_CHUNK_SIZEis set too small, cutting off field associations within the table during splitting, or the complete entry merging strategy ofTABLE_PARSE_STRATEGYis not enabled.
How to confirm the configuration is properly set
- Upload a single typical railway and highway financing daily report document, and verify that the parsed table structure is complete with no missing field splits.
- Verify that each segment in the chunking results contains complete financing project information, with no separation of project sections and financing amounts.
- Simulate uploading a file of a size matching actual usage, and confirm that the upload process has no errors.
- Review parsing logs to confirm that no timeout errors are triggered, and the custom parsing service responds as expected.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.