# Pinecone: Major incident: [Serverless][Azure][eastus2] 5xx errors on some read and write operations

**Summary:** Pinecone reported a major incident affecting Serverless Indexes in Azure eastus2, with 5xx errors on some read and write operations. It started at 2025-10-21 17:57 UTC and resolved at 2025-10-21 19:24 UTC, lasting 1 h 26 min. A fix was implemented; no cause was stated. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2025-10-21 17:57 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/3mcc2zg8y9pv](https://stspg.io/3mcc2zg8y9pv)
- [Company: Pinecone](https://rewindex.com/company/pinecone.md)
- Versions: before (none: first archived) → after incident\_version:35/rnj8t1pwnwt5@150045d1512c
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ [Serverless][Azure][eastus2] 5xx errors on some read and write operations
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-10-21 17:57 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-10-21 19:24 UTC
```

**6. Added: Affected components**

```diff
+ Azure eastus2, Serverless Indexes - Azure eastus2
```

**7. Added: Update** (investigating) · 2025-10-21 17:57 UTC

```diff
+ We are currently investigating this issue.
```

**8. Added: Update** (identified) · 2025-10-21 18:36 UTC

```diff
+ The issue has been identified and a fix is being implemented.
```

**9. Added: Update** (monitoring) · 2025-10-21 19:03 UTC

```diff
+ A fix has been implemented and we are monitoring the results.
```

**10. Added: Update** (resolved) · 2025-10-21 19:24 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-10-21 17:57 UTC | Major incident: \[Serverless\]\[Azure\]\[eastus2\] 5xx errors on some read and write operations (this change) | outage |

All Pinecone changes: [timeline](https://rewindex.com/company/pinecone/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


---
Canonical: https://rewindex.com/change/i3d45c76d19e40f · Markdown: https://rewindex.com/change/i3d45c76d19e40f.md · JSON: https://rewindex.com/api/v1/changes/i3d45c76d19e40f · Generated 2026-10-18T02:54:51.764Z