Write Rejection Indicates Schema Mismatch
criticalconfigurationUpdated Feb 23, 2026
InfluxDB rejects points when field data types don't match the existing schema. A 400 response with field errors signals type conflicts between incoming data and stored data.
Technologies:
How to detect:
Monitor write API responses for 400 status codes. Parse response body for 'field error' messages. Track write rejection rate and examine rejected line protocol for type mismatches.
Recommended action:
Compare rejected point field types against existing schema using SHOW FIELD KEYS. Correct the data source to send matching types or create a new measurement with the correct schema. Implement schema validation before writes.