| # Migration Notes | |
| ## doc_id formula change — 2026-03-13 | |
| **Changed:** `doc_id` is now computed as `UUID5(NamespaceURL, url)` — a deterministic UUID derived from the canonical URL, stable across crawls and reruns. | |
| **Before (shards below):** `doc_id` was the UUID extracted from the WARC-Record-ID header: | |
| ``` | |
| doc_id = TrimPrefix(warc_record_id, "<urn:uuid:") # e.g. <urn:uuid:abc-123> → abc-123 | |
| ``` | |
| ### Affected shards — CC-MAIN-2026-08 (232 shards, need re-export) | |
| | Range | Count | | |
| |---|---| | |
| | 00000–00047 | 48 | | |
| | 00058 | 1 | | |
| | 00101–00148 | 48 | | |
| | 00251–00291 | 41 | | |
| | 00401–00424 | 24 | | |
| | 00551–00562 | 12 | | |
| | 00701–00720 | 20 | | |
| | 00851–00888 | 38 | | |
| | **Total** | **232** | | |
| These shards will be re-exported automatically as the pipeline processes them again with `--republish`. | |
| ### Client-side workaround (no re-export needed) | |
| The `url` column is correct and stable in **all** shards. Recompute `doc_id` client-side: | |
| ```python | |
| import uuid | |
| doc_id = str(uuid.uuid5(uuid.NAMESPACE_URL, row["url"])) | |
| ``` | |
| ```go | |
| import "github.com/google/uuid" | |
| docID := uuid.NewSHA1(uuid.NameSpaceURL, []byte(row.URL)).String() | |
| ``` | |