# ClickHouse Cloud: CDC ClickPipes stuck in maintenance state

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-07-22 11:53 UTC · Resolved: 2026-07-22 14:36 UTC · Duration: 2.7 h
- Updates: 5 · Affected components: AWS eu-central-1, AWS eu-central-1, AWS us-east-2, AWS ap-southeast-2, AWS ap-northeast-2, AWS eu-west-1, AWS ca-central-1, AWS il-central-1
- [Vendor status page: https://status.clickhouse.com/incidents/01KY4TRYA1FYRMZAHNCDPFCTC6](https://status.clickhouse.com/incidents/01KY4TRYA1FYRMZAHNCDPFCTC6)
- [Company: ClickHouse Cloud](https://rewindex.com/company/clickhouse-cloud.md)

## Summary

CDC ClickPipes became stuck in maintenance during a weekly upgrade, initially in eu-central-1, with services in other regions also affected. ClickHouse Cloud rated the incident major; it ran from 2026-07-22 11:53 UTC to 2026-07-22 14:36 UTC, lasting 2 h 42 min. Services recovered, but the upgrade rollout remained on hold pending confirmation it could avoid the underlying pod networking failure mode. _(machine-written, sol)_
## Timeline of updates

- **investigating** 2026-07-22 11:53 UTC: As part of our weekly upgrade process, CDC ClickPipes in eu-central-1 became stuck in maintenance state. The team is working on a mitigation.
- **identified** 2026-07-22 12:36 UTC: Services in eu-central-1 have recovered. We're in the process of manually recovering ~20 services in other regions.
- **identified** 2026-07-22 13:05 UTC: Most services have fully recovered. Continuing to roll out the fix to remaining 4 services (all in eu-central-1, us-east-2).
- **monitoring** 2026-07-22 13:39 UTC: All services have recovered; we will continue monitoring the affected nodes and consolidating our findings. Please reach out to our support team to request access to the RCA, when available.
- **resolved** 2026-07-22 14:36 UTC: The CDC ClickPipes upgrade rollout remains on hold while we confirm we can safely proceed without triggering the underlying pod networking failure mode that triggered the incident.

## Rewindex changes for this incident

- 2026-07-22 11:53 UTC: [Major incident: CDC ClickPipes stuck in maintenance state](https://rewindex.com/change/i4376ccc7c44e2c.md)


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Canonical: https://rewindex.com/company/clickhouse-cloud/incidents/01KY4TRYA1FYRMZAHNCDPFCTC6 · Markdown: https://rewindex.com/company/clickhouse-cloud/incidents/01KY4TRYA1FYRMZAHNCDPFCTC6.md · JSON: https://rewindex.com/api/v1/companies/clickhouse-cloud/incidents/01KY4TRYA1FYRMZAHNCDPFCTC6 · Generated 2026-10-18T12:34:43.686Z