What the data for this category looks like
Thermal coal market data is sourced primarily from domestic bulk commodity spot trading markets, futures exchanges, and publicly available industry data sources. It is updated once per trading day, with full data released by 17:00. The data uses a structured format, with fields including product name, specification grade, trading market, settlement price, trading volume, and open interest. The settlement price unit is yuan per ton. Specification grades are marked by calorific value rating, such as 5500 kcal thermal coal.
What constraints do these characteristics impose on workflow orchestration
The multi-source nature of thermal coal data requires workflows to be configured with cross-data source association nodes to align and integrate spot and futures market data. The fixed update schedule requires trigger nodes to execute only on trading days, avoiding invalid pull requests on non-trading days. The structured field specification requirements require workflows to be configured with field filtering rules to only process thermal coal data for the target calorific value rating. Additionally, some data sources have call frequency limits, requiring workflows to control pull frequency to avoid triggering rate limits. Minor differences in return formats across data sources require workflows to be configured with structured validation rules to ensure accurate field parsing.
How to set the configurations
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
trigger_type | Scheduled Trigger (By Calendar) | Thermal coal market data only updates on trading days. This setting ensures scheduled pulls on trading days and avoids invalid requests on non-trading days |
data_source_poll_interval | 86400 seconds | Market data updates once per day. High-frequency pulls waste resources and may trigger data source rate limits |
structured_data_schema | Validate that fields include "product name" and "settlement price", and that "product name" matches "thermal coal" | Filter data from non-thermal coal categories, ensuring the workflow only processes market data for the target product |
workflow_concurrency | 1–2 concurrent executions | Thermal coal data source interfaces have limited call frequency. High concurrency will trigger rate limits. Setting 1-2 concurrent executions balances execution efficiency and rate limit risk |
node_error_retry_count | 2 retries | Market data interfaces may experience temporary fluctuations. A small number of retries reduces failure rates for single runs |
workflow_timeout | 600 seconds | Pulling multi-source market data takes time. Setting a reasonable timeout threshold prevents unintended node interruptions |
The parameter values provided on this page are common recommended starting points for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require individual analysis. It is recommended to test on your own samples before finalizing settings.
Three common mistakes
- Symptom: A
500 Gateway forwarding error because service is disconnectederror occurs during workflow runs. Cause: No timeout threshold is configured for data source nodes, leading to connection timeout disconnections when pulling thermal coal market data. - Symptom: No concurrent execution effect when running multiple workflow instances in batch. Cause: Concurrency configuration for the
workflow_concurrencyparameter is not enabled, and the default single-threaded execution mode is used. - Symptom: Workflow run logs prompt parsing errors related to
offset 17. Cause: The field order in the structured data validation rule does not match the actual return format of the data source, leading to field parsing offset.
How to confirm proper configuration
- Manually trigger the workflow once, review the pulled data source fields, and confirm that only market data for thermal coal-related products is included.
- Review the workflow's scheduled trigger configuration, confirm that the trigger time is later than the fixed update time for thermal coal market data, to avoid pulling outdated unupdated data.
- Configure a batch run test to verify that no interface rate limit-related errors occur when multiple workflow instances execute simultaneously.
- Check the node icons and file upload functions in the workflow interface, and confirm there are no abnormal prompts.
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.