Publish shard CC-MAIN-2026-08/01280
Browse files- README.md +10 -10
- data/CC-MAIN-2026-08/01280.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 **18,
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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) | 2.2 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~39.
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| Final Parquet (Zstd level 19) | 26.7 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 2.2 TB of uncompressed HTML down to
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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 64h
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Convert (HTML → MD) ██░░░░░░░░░░░░░░░░░░░░░░ total 5h 23m 35s avg 20s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 15h
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 53m 46s avg 25s
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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 **18,627,930 documents across 962 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 962 files of CC-MAIN-2026-08 (18,627,930 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 962 files (measured) | 100,000 files (projected) | Reduction |
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| Raw WARC (.warc.gz, downloaded) | ~779.7 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 2.2 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~39.5 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 26.7 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 2.2 TB of uncompressed HTML down to 84.0 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: ~779.7 GB of raw gzipped WARCs becomes **26.7 GB of Parquet** — a **96.6% total reduction** — containing 18,627,930 clean markdown documents.
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### Processing Times
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Pipeline timings across 962 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 64h 38m 57s avg 4m 1s
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Convert (HTML → MD) ██░░░░░░░░░░░░░░░░░░░░░░ total 5h 23m 35s avg 20s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 15h 9m 2s avg 56s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 53m 46s avg 25s
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```
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data/CC-MAIN-2026-08/01280.parquet
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@@ -0,0 +1,3 @@
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version https://git-lfs.github.com/spec/v1
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oid sha256:e6f75f0d022d6de235910d143c27f773e9fcff6a53869eed9281d5d4522a72fe
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size 29606455
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stats.csv
CHANGED
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@@ -694,6 +694,7 @@ CC-MAIN-2026-08,1276,19185,2550260674,91966065,29524037,2026-03-13T21:41:29Z,480
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| 694 |
CC-MAIN-2026-08,1277,19513,2629606296,93340605,29191686,2026-03-13T21:56:11Z,784,0,106,12
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| 695 |
CC-MAIN-2026-08,1278,19764,2626938399,90419690,28839516,2026-03-13T22:07:15Z,536,0,158,15
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| 696 |
CC-MAIN-2026-08,1279,19706,2585020918,92720492,29244257,2026-03-13T22:20:41Z,613,0,188,14
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| 697 |
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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| 699 |
CC-MAIN-2026-08,1303,19681,2609544680,95027524,30250671,2026-03-13T11:40:27Z,0,0,0,0
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| 694 |
CC-MAIN-2026-08,1277,19513,2629606296,93340605,29191686,2026-03-13T21:56:11Z,784,0,106,12
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| 695 |
CC-MAIN-2026-08,1278,19764,2626938399,90419690,28839516,2026-03-13T22:07:15Z,536,0,158,15
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| 696 |
CC-MAIN-2026-08,1279,19706,2585020918,92720492,29244257,2026-03-13T22:20:41Z,613,0,188,14
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CC-MAIN-2026-08,1280,19494,2585853708,92016326,29606455,2026-03-13T22:32:56Z,456,0,278,0
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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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| 700 |
CC-MAIN-2026-08,1303,19681,2609544680,95027524,30250671,2026-03-13T11:40:27Z,0,0,0,0
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