Publish shard CC-MAIN-2026-08/01262
Browse files- README.md +10 -10
- data/CC-MAIN-2026-08/01262.parquet +3 -0
- stats.csv +1 -0
README.md
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Open Index is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown using [trafilatura](https://github.com/adbar/trafilatura), and packages the result into Parquet files with full WARC metadata preserved.
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The dataset currently includes crawl **CC-MAIN-2026-08** with **16,
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Open Index is released under the **Open Data Commons Attribution License (ODC-By) v1.0**, the same license used by Common Crawl.
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### Compression Ratios
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Numbers below are actual measurements summed across all
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| Stage |
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| Raw WARC (.warc.gz, downloaded) | ~
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| HTML extracted (uncompressed) | 2.0 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~35.0 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 23.
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The big win is the HTML → Markdown step: trafilatura strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 2.0 TB of uncompressed HTML down to 74.
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End to end: ~
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### Processing Times
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Pipeline timings across
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```
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Download (raw WARC) ████████████████████████ total 50h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 4h 11m 3s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 11h
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 13m 36s avg 26s
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```
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Open Index is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown using [trafilatura](https://github.com/adbar/trafilatura), and packages the result into Parquet files with full WARC metadata preserved.
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The dataset currently includes crawl **CC-MAIN-2026-08** with **16,524,159 documents across 854 shards**. We plan to add more snapshots over time.
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Open Index is released under the **Open Data Commons Attribution License (ODC-By) v1.0**, the same license used by Common Crawl.
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### Compression Ratios
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Numbers below are actual measurements summed across all 854 files of CC-MAIN-2026-08 (16,524,159 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 854 files (measured) | 100,000 files (projected) | Reduction |
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| Raw WARC (.warc.gz, downloaded) | ~692.2 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 2.0 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~35.0 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 23.7 GB | ~2.9 TB | **-32.4%** vs packed WARC |
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The big win is the HTML → Markdown step: trafilatura strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 2.0 TB of uncompressed HTML down to 74.5 GB of markdown — a **98.3% reduction** — before any file-level compression is applied. Parquet with Zstd level 19 then compresses the markdown a further 68.2%.
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End to end: ~692.2 GB of raw gzipped WARCs becomes **23.7 GB of Parquet** — a **96.6% total reduction** — containing 16,524,159 clean markdown documents.
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### Processing Times
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Pipeline timings across 854 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 50h 20m 43s avg 3m 32s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 4h 11m 3s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 11h 20m 19s avg 47s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 13m 36s avg 26s
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```
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data/CC-MAIN-2026-08/01262.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:e48394370985601f31184a9a5fc2820dc2758af876e1b259b6b848166447b5e9
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size 29974359
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stats.csv
CHANGED
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@@ -586,6 +586,7 @@ CC-MAIN-2026-08,1258,19135,2554477198,92165066,28960395,2026-03-13T18:45:41Z,406
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CC-MAIN-2026-08,1259,19563,2631677258,93204182,29554483,2026-03-13T18:54:30Z,413,0,93,13
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CC-MAIN-2026-08,1260,19561,2592128070,96205481,30189158,2026-03-13T19:02:27Z,419,0,68,30
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CC-MAIN-2026-08,1261,19531,2552270985,92940606,29109279,2026-03-13T19:09:41Z,368,0,70,13
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CC-MAIN-2026-08,1301,19417,2601765043,93758124,29790521,2026-03-13T11:40:27Z,0,0,0,0
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CC-MAIN-2026-08,1302,19471,2592470194,95488689,29747494,2026-03-13T11:40:27Z,0,0,0,0
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CC-MAIN-2026-08,1303,19681,2609544680,95027524,30250671,2026-03-13T11:40:27Z,0,0,0,0
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CC-MAIN-2026-08,1259,19563,2631677258,93204182,29554483,2026-03-13T18:54:30Z,413,0,93,13
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CC-MAIN-2026-08,1260,19561,2592128070,96205481,30189158,2026-03-13T19:02:27Z,419,0,68,30
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CC-MAIN-2026-08,1261,19531,2552270985,92940606,29109279,2026-03-13T19:09:41Z,368,0,70,13
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CC-MAIN-2026-08,1262,19583,2619099150,96747461,29974359,2026-03-13T19:18:11Z,431,0,83,0
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CC-MAIN-2026-08,1301,19417,2601765043,93758124,29790521,2026-03-13T11:40:27Z,0,0,0,0
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CC-MAIN-2026-08,1302,19471,2592470194,95488689,29747494,2026-03-13T11:40:27Z,0,0,0,0
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CC-MAIN-2026-08,1303,19681,2609544680,95027524,30250671,2026-03-13T11:40:27Z,0,0,0,0
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