# Census: Major incident: Partial Sync Outage

**Summary:** Census reported a major Sync Engine outage starting 2024-09-11 19:00 UTC, lasting 5 h 5 min and resolved at 2024-09-12 00:06 UTC. Empty unload batches could fail with file or Parquet conversion errors; after a fix, some syncs encountered function errors, primarily advanced sync engine mirror syncs with no deletes. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2024-09-11 19:00 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/s8rgmzmhgfhl](https://stspg.io/s8rgmzmhgfhl)
- [Company: Census](https://rewindex.com/company/census.md)
- Versions: before (none: first archived) → after incident\_version:136/sxqcd9zr54wy@9a1fdc8b8014
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Partial Sync Outage
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2024-09-11 19:00 UTC
```

**5. Added: Resolved time**

```diff
+ 2024-09-12 00:06 UTC
```

**6. Added: Affected components**

```diff
+ Sync Engine
```

**7. Added: Update** (identified) · 2024-09-11 19:00 UTC

```diff
+ Syncs empty unload batches have a chance of failing with either a "IO Error: No files found that match the pattern IGNORED_EMPTY_FILE" or a "Parquet Conversion Error". The issue has been identified and a fix is being released.
```

**8. Added: Update** (monitoring) · 2024-09-11 19:23 UTC

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

**9. Added: Update** (investigating) · 2024-09-11 20:50 UTC

```diff
+ A subset of the previously affected syncs are now hitting "No function matches the given name and argument types" errors. It's primarily limited to advanced sync engine mirror syncs with no deletes. Investigation continues.
```

**10. Added: Update** (resolved) · 2024-09-12 00:06 UTC

```diff
+ The issue has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2024-09-11 19:00 UTC | Major incident: Partial Sync Outage (this change) | outage |

All Census changes: [timeline](https://rewindex.com/company/census/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/i9a4ee6dc9a80fb · Markdown: https://rewindex.com/change/i9a4ee6dc9a80fb.md · JSON: https://rewindex.com/api/v1/changes/i9a4ee6dc9a80fb · Generated 2026-10-18T03:55:50.285Z