Issue
When syncing large volumes of data to a destination using Segment Reverse ETL, you may encounter a 429 Too Many Requests error. This error occurs when the number of API requests sent exceeds the destination's hourly quota, resulting in failed syncs and a significant portion of records not being delivered.
Product
Twilio Segment
Environment
Segment Console
Cause
Reverse ETL sends data to destinations at full speed by default, without built-in throttling. If the destination's batching setting is not enabled, each record is sent as an individual API request. This can quickly exceed the destination's hourly API request limit, causing the API to block further requests and resulting in 429 Too Many Requests errors.
Resolution
To prevent exceeding your destination's API quota and avoid the
429 error, you should configure batching:- In the Segment Console, navigate to your Reverse ETL mapping settings.
- Enable the batching option for your specific destination (for example, Batch Data or Use Bulk API).
- Set this field to
trueto bundle records and send them to the destination's endpoint in batches. - Monitor the sync to ensure the number of API requests remains within the destination's limit and that the sync completes successfully.
Additional Information
- If the batch setting is not configured, large syncs may be blocked after the quota is reached, and remaining records will not be sent.
- Always verify that batching is enabled when syncing high volumes of data to any destination that supports Batch APIs.