Reference only; verify against the target FastGPT release and deployment documentation.
What the data for this category looks like
Document data related to construction machinery is sourced from procurement contracts, maintenance records, quality inspection reports, construction plans, and component drawing descriptions created during equipment manufacturing. Data updates follow project or maintenance cycles, with no fixed frequency. Documents include structured parameter tables, long technical descriptions, and standardized fields. Common fields include equipment model, serial number, operating hours, torque values, and more. Units mostly use common engineering standard units such as hours, newton meters, and megapascals. Some documents include high-definition drawing attachments, and the overall file size varies widely.
What constraints these characteristics impose on the document parsing and chunking step
The mixed multi-table layout of construction machinery documents can cause table misalignment in general parsing tools. Chunking logic must prioritize identifying table boundaries. The layout where long technical descriptions and parameter tables are interspersed requires that chunking avoids splitting content across tables. The unit-binding nature of engineering fields requires that chunking preserves the association between adjacent fields, preventing parameters and units from being disconnected during retrieval. Some documents include large-size drawing attachments, which increase parsing time and file size. Corresponding parsing and chunking thresholds need to be adjusted to avoid exceeding system default limits.
How to set the configurations
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Adapts to the mixed layout of long technical paragraphs and parameter tables in construction machinery documents, avoiding splitting that breaks the association between parameters and units |
chunkSplitter | Split by paragraph + table boundary | Matches the mixed layout of long text and structured tables in documents, reducing the risk of table misalignment from general parsing tools |
customPdfParse | Enabled | Optimizes parsing accuracy for complex tables and drawing attachments in construction machinery documents by enabling a custom parsing service |
UPLOAD_FILE_MAX_SIZE | 500 MB | Adapts to construction machinery documents with high-definition drawing attachments, preventing uploads from being blocked by the system |
PARSE_FILE_TIMEOUT_SECONDS | 300–600 seconds | Adapts to the parsing time of large-volume documents and complex tables, preventing parsing failures caused by early timeouts |
chunkSettingMode | Manual mode | Allows adjustment of chunking rules for different types of construction machinery documents, adapting to diverse document formats |
Three common mistakes
- Phenomenon: Column misalignment or cell content shift appears in component parameter tables in uploaded construction machinery PDF documents. Cause: The
chunkSplitteris not configured to split by table boundaries, and the general chunking logic splits by fixed characters, destroying the table structure. - Phenomenon: After uploading a large-volume construction machinery document, the system returns a parsing timeout error or prompts that file parsing failed. Cause: The values of
PARSE_FILE_TIMEOUT_SECONDSandUPLOAD_FILE_MAX_SIZEare not adjusted, exceeding the system default thresholds and causing blocking or timeout. - Phenomenon: In the chunked document fragments, engineering parameters and their corresponding units are separated, and complete parameter information cannot be matched during retrieval. Cause: The
chunkSizevalue is too small, splitting parameters bound to units into two separate fragments.
How to confirm the configuration is correct
- Upload a construction machinery PDF document that includes a standard parameter table, check that the parsed text has complete tables without misalignment, and verify that parameters and units are in the same fragment.
- Enter the custom parsing service configuration page, confirm that the
customPdfParseswitch is enabled, and the service address is configured correctly. - Upload a construction machinery document with a volume larger than 100 MB, check that the upload and parsing processes are not interrupted, and no timeout error prompts appear.
- Adjust
chunkSizeto different values, compare the chunking results, and confirm that the chunking logic matches the document layout characteristics.
The values provided are common starting points and should be measured 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.