What This Category's Data Looks Like
Thermal coal market and yield data comes primarily from domestic bulk commodity spot trading platforms and Zhengzhou Commodity Exchange thermal coal futures contract APIs. Full daily updates are completed after each trading day closes. Some spot quote data updates at fixed intervals. Each data document includes fields such as contract identifier, delivery month, benchmark price, daily average transaction price, daily highest transaction price, daily lowest transaction price, total open interest, total transaction volume, and price change amount. Price fields use units of yuan/ton. Transaction volume and open interest use standard trading lot units.
Constraints Imposed on Deployment and Upgrade
The multi-delivery month fields and fixed update window of thermal coal data require scheduled tasks aligned with exchange closing times during deployment. This prevents delayed or duplicate data pulls. Parsing rules must adapt to multi-contract fields. Do not reuse field mapping configurations from other categories during upgrades. Field matching failures will occur otherwise. The daily single-update feature requires appropriate cache retention durations. This avoids frequent data pulls that consume resources. For ARM architecture deployments, confirm compatibility between data source APIs and image architectures. During upgrades, sync updated ARM-compatible dependency libraries. Runtime errors will occur otherwise.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
SCHEDULE_CRON_EXPR | 0 18 * * 1-5 | Aligns with the 1-3 hour update window after thermal coal trading day closes, ensuring access to the latest daily market data |
DATA_PARSE_FIELD_MAPPING | Set via actual measurement | Thermal coal data includes exclusive fields such as delivery month, so field names must match exactly those returned by the data source |
CACHE_EXPIRE_TIME | 86400 seconds | Market data updates only once per day, so a 24-hour cache retention period avoids repeated data pulls |
DOCKER_PLATFORM | linux/amd64 or linux/arm64 | Adapts to different deployment architectures, supporting ARM architecture deployments |
PARSE_WORKFLOW_TIMEOUT | 300 seconds | Thermal coal data parsing requires matching multiple contract fields, so sufficient parsing time is reserved |
POST_PRESIGNED_URL_EXPIRE | 3600 seconds | Ensures uploaded thermal coal market data source files are parsed before expiration, avoiding expired request errors |
The parameter values provided on this page are common starting points for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require case-by-case analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Mistakes
- Scenario: After upgrading to version 4.14.0, the interface returns the error
Failed to create post presigned urlwhen uploading thermal coal market data source files via the workflow. Cause: The object storage signature validity period parameter was not reconfigured after the upgrade. The default signature validity period of the new version differs from the old version, causing the upload request to expire. - Scenario: When deploying on ARM architecture, official compatible Docker images cannot be pulled. Cause: The correct image platform parameter was not specified. The default pulled amd64 image cannot run on ARM architecture devices.
- Scenario: After upgrading from version 4.9.0 to 4.12.3, thermal coal data parsing fails, with empty field matches. Cause: The old field mapping configuration was not retained during the upgrade. The new version's parsing rules are adapted to other categories by default, and no adjustments were made for exclusive fields such as thermal coal delivery month.
How to Confirm Proper Configuration
- Manually trigger the workflow bound to thermal coal market data, and verify that the returned results include exclusive fields such as delivery month, benchmark price, and price change amount.
- View scheduled task execution logs, and confirm that data pulling and parsing are completed automatically at the specified time on trading days, with no timeout exceptions.
- Test uploading a thermal coal market data source file, and confirm that no
Failed to create post presigned urlerror is returned, and the file can be parsed and stored normally. - Start a test instance in an ARM architecture deployment environment, and confirm that the workflow can normally pull and parse thermal coal data.
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.