Publish shard CC-MAIN-2026-08/01022
Browse files- README.md +10 -10
- data/CC-MAIN-2026-08/01022.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.
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| Final Parquet (Zstd level 19) | 24.1 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 75.
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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 51h
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Convert (HTML → MD) ██░░░░░░░░░░░░░░░░░░░░░░ total 4h 30m 54s avg 18s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 11h
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 19m 40s 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 **16,835,036 documents across 870 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 870 files of CC-MAIN-2026-08 (16,835,036 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 870 files (measured) | 100,000 files (projected) | Reduction |
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| Raw WARC (.warc.gz, downloaded) | ~705.2 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) | ~35.7 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 24.1 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 75.9 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: ~705.2 GB of raw gzipped WARCs becomes **24.1 GB of Parquet** — a **96.6% total reduction** — containing 16,835,036 clean markdown documents.
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### Processing Times
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Pipeline timings across 870 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 51h 55m 20s avg 3m 34s
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Convert (HTML → MD) ██░░░░░░░░░░░░░░░░░░░░░░ total 4h 30m 54s avg 18s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 11h 50m 12s avg 48s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 19m 40s avg 26s
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```
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data/CC-MAIN-2026-08/01022.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:4e146224982ba6138b0ddf56a01b213a75c524a93cb4bebbe96113dc460d25d6
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size 28977417
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stats.csv
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@@ -529,6 +529,7 @@ CC-MAIN-2026-08,1018,19185,2567255288,91523314,28541903,2026-03-13T19:08:26Z,387
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CC-MAIN-2026-08,1019,19755,2616441881,95366689,29492176,2026-03-13T19:16:23Z,348,0,130,15
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CC-MAIN-2026-08,1020,19365,2570771466,96094091,30803898,2026-03-13T19:24:56Z,422,0,91,14
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CC-MAIN-2026-08,1021,19726,2630098078,92943742,29797665,2026-03-13T19:29:26Z,229,0,44,14
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CC-MAIN-2026-08,1101,19721,2641197765,95719568,30240239,2026-03-13T09:59:33Z,564,0,296,0
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CC-MAIN-2026-08,1102,19562,2608129691,99280759,31748974,2026-03-13T10:28:07Z,1518,0,191,0
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CC-MAIN-2026-08,1103,19270,2517580674,89253461,28361470,2026-03-13T10:55:39Z,1380,0,268,0
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CC-MAIN-2026-08,1019,19755,2616441881,95366689,29492176,2026-03-13T19:16:23Z,348,0,130,15
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CC-MAIN-2026-08,1020,19365,2570771466,96094091,30803898,2026-03-13T19:24:56Z,422,0,91,14
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CC-MAIN-2026-08,1021,19726,2630098078,92943742,29797665,2026-03-13T19:29:26Z,229,0,44,14
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CC-MAIN-2026-08,1022,19484,2581188446,92772433,28977417,2026-03-13T19:40:28Z,529,0,126,0
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CC-MAIN-2026-08,1101,19721,2641197765,95719568,30240239,2026-03-13T09:59:33Z,564,0,296,0
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CC-MAIN-2026-08,1102,19562,2608129691,99280759,31748974,2026-03-13T10:28:07Z,1518,0,191,0
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CC-MAIN-2026-08,1103,19270,2517580674,89253461,28361470,2026-03-13T10:55:39Z,1380,0,268,0
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