Publish shard CC-MAIN-2026-08/01257
Browse files- README.md +10 -10
- data/CC-MAIN-2026-08/01257.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 **15,
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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) | 1.9 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~33.
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| Final Parquet (Zstd level 19) | 22.9 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 1.9 TB of uncompressed HTML down to 72.
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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 47h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 3h 35m 25s avg 15s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 10h
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ total 6h 5m 0s 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 **15,980,270 documents across 826 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 826 files of CC-MAIN-2026-08 (15,980,270 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 826 files (measured) | 100,000 files (projected) | Reduction |
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| Raw WARC (.warc.gz, downloaded) | ~669.5 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 1.9 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~33.9 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 22.9 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 1.9 TB of uncompressed HTML down to 72.1 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: ~669.5 GB of raw gzipped WARCs becomes **22.9 GB of Parquet** — a **96.6% total reduction** — containing 15,980,270 clean markdown documents.
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### Processing Times
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Pipeline timings across 826 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 47h 42m 46s avg 3m 27s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 3h 35m 25s avg 15s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 10h 34m 37s avg 46s
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ total 6h 5m 0s avg 26s
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```
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data/CC-MAIN-2026-08/01257.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:8f60ba15ecd19a8068d4cc7ec022bb0e6fd54ac349484a63f820473a3aceaf51
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size 28980328
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stats.csv
CHANGED
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@@ -558,6 +558,7 @@ CC-MAIN-2026-08,1253,19587,2591803279,95323004,29409281,2026-03-13T18:07:11Z,273
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CC-MAIN-2026-08,1254,19385,2574775357,90964705,29287533,2026-03-13T18:12:59Z,301,0,26,26
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| 559 |
CC-MAIN-2026-08,1255,19793,2590593189,91962640,29397083,2026-03-13T18:20:26Z,347,0,117,12
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| 560 |
CC-MAIN-2026-08,1256,19623,2586404184,93667218,29799650,2026-03-13T18:29:57Z,396,0,170,30
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| 561 |
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-2026-08,1254,19385,2574775357,90964705,29287533,2026-03-13T18:12:59Z,301,0,26,26
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| 559 |
CC-MAIN-2026-08,1255,19793,2590593189,91962640,29397083,2026-03-13T18:20:26Z,347,0,117,12
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| 560 |
CC-MAIN-2026-08,1256,19623,2586404184,93667218,29799650,2026-03-13T18:29:57Z,396,0,170,30
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CC-MAIN-2026-08,1257,19311,2574452525,92827599,28980328,2026-03-13T18:37:56Z,350,0,127,0
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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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