Publish shard CC-MAIN-2026-08/00529
Browse files- README.md +11 -11
- data/CC-MAIN-2026-08/00529.parquet +3 -0
- stats.csv +2 -1
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) | ~778.
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| HTML extracted (uncompressed) | 2.2 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~39.4 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 26.
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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 83.
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End to end: ~778.
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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
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```
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### Dataset Charts
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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 **18,608,436 documents across 961 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 961 files of CC-MAIN-2026-08 (18,608,436 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 961 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~778.9 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) | ~39.4 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 83.9 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: ~778.9 GB of raw gzipped WARCs becomes **26.7 GB of Parquet** — a **96.6% total reduction** — containing 18,608,436 clean markdown documents.
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### Processing Times
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Pipeline timings across 961 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 64h 31m 21s avg 4m 1s
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Convert (HTML → MD) ██░░░░░░░░░░░░░░░░░░░░░░ total 5h 23m 35s avg 20s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 15h 4m 24s avg 56s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 53m 14s avg 25s
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```
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### Dataset Charts
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data/CC-MAIN-2026-08/00529.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:919bb05afe404d70a6681e30e822d65bc02c925c4c85dcd29758c9f4a03f08c6
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size 30314956
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stats.csv
CHANGED
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@@ -379,6 +379,7 @@ CC-MAIN-2026-08,525,19384,2588170608,94494308,29559719,2026-03-13T21:40:47Z,469,
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CC-MAIN-2026-08,526,19546,2593951955,90603665,29115122,2026-03-13T21:56:10Z,784,0,107,12
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CC-MAIN-2026-08,527,19691,2569948084,97505695,31796873,2026-03-13T22:04:37Z,417,0,118,31
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CC-MAIN-2026-08,528,19705,2604246714,96317981,30640287,2026-03-13T22:17:41Z,528,0,249,19
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CC-MAIN-2026-08,551,19551,2609034951,89980913,29167227,2026-03-13T06:42:51Z,280,0,20,176
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CC-MAIN-2026-08,552,19402,2594817630,94092761,30309254,2026-03-13T06:48:30Z,211,0,46,80
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CC-MAIN-2026-08,553,19856,2617133708,99106486,30365588,2026-03-13T06:52:51Z,116,0,23,120
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CC-MAIN-2026-08,775,19435,2565654435,92799653,30224744,2026-03-13T21:56:11Z,770,0,128,12
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CC-MAIN-2026-08,776,19485,2557767648,97091370,30971578,2026-03-13T22:04:14Z,379,0,105,14
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CC-MAIN-2026-08,777,19589,2585482711,97636638,31875194,2026-03-13T22:16:47Z,538,0,197,18
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CC-MAIN-2026-08,778,19374,2563110936,89906933,28709645,2026-03-13T22:28:11Z,579,0,125,
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CC-MAIN-2026-08,851,19575,2612873485,97000364,30911294,2026-03-13T06:41:39Z,163,0,37,204
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CC-MAIN-2026-08,852,19334,2546015208,94959847,30205044,2026-03-13T06:45:52Z,183,0,57,11
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CC-MAIN-2026-08,853,19694,2567973975,95901932,30303494,2026-03-13T06:50:12Z,150,0,28,80
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CC-MAIN-2026-08,527,19691,2569948084,97505695,31796873,2026-03-13T22:04:37Z,417,0,118,31
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CC-MAIN-2026-08,528,19705,2604246714,96317981,30640287,2026-03-13T22:17:41Z,528,0,249,19
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CC-MAIN-2026-08,529,19635,2618160914,92856775,30314956,2026-03-13T22:28:41Z,515,0,124,0
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CC-MAIN-2026-08,551,19551,2609034951,89980913,29167227,2026-03-13T06:42:51Z,280,0,20,176
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CC-MAIN-2026-08,552,19402,2594817630,94092761,30309254,2026-03-13T06:48:30Z,211,0,46,80
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CC-MAIN-2026-08,553,19856,2617133708,99106486,30365588,2026-03-13T06:52:51Z,116,0,23,120
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CC-MAIN-2026-08,775,19435,2565654435,92799653,30224744,2026-03-13T21:56:11Z,770,0,128,12
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CC-MAIN-2026-08,776,19485,2557767648,97091370,30971578,2026-03-13T22:04:14Z,379,0,105,14
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CC-MAIN-2026-08,777,19589,2585482711,97636638,31875194,2026-03-13T22:16:47Z,538,0,197,18
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CC-MAIN-2026-08,778,19374,2563110936,89906933,28709645,2026-03-13T22:28:11Z,579,0,125,26
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CC-MAIN-2026-08,851,19575,2612873485,97000364,30911294,2026-03-13T06:41:39Z,163,0,37,204
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CC-MAIN-2026-08,852,19334,2546015208,94959847,30205044,2026-03-13T06:45:52Z,183,0,57,11
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CC-MAIN-2026-08,853,19694,2567973975,95901932,30303494,2026-03-13T06:50:12Z,150,0,28,80
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