AI BriefingSeptember 29 Outage Update: Read-Only Repls
Key point
Replit resolved a read-only Repl outage caused by an unfinished build deployment mistake and recovered 98% of the data.
Details
On September 29, an incident occurred in which an unfinished build was deployed to Replit's data storage infrastructure. This caused Repls that were open between 14:00 and 16:30 Pacific Standard Time to become read-only or stop functioning.
The root cause of this outage was a lack of deployment guardrails, which resulted in unfinished features (commit batching and asynchronous execution) that were being validated in the test cluster being mistakenly deployed to the production cluster.
The Replit team carried out an immediate rollback along with a 24-hour recovery effort, and has now recovered 98% of the affected Repls. Recovery work is ongoing for the remaining 2%.
To prevent similar incidents in the future, the following measures will be taken:
- Blocking anomalous behavior through the introduction of Automated Canary Analysis
- Throttling storage infrastructure deployment speed to prevent the spread of outages
- Updating the backup system for faster, more granular data recovery
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