Publish shard CC-MAIN-2026-08/05265
Browse files- README.md +11 -11
- data/CC-MAIN-2026-08/05265.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 **22,
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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) | 2.7 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~48.
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| Final Parquet (Zstd level 19) | 32.5 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 2.7 TB of uncompressed HTML down to 102.
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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 83h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 5h 48m 17s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 20h
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 7h 45m
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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 **22,723,411 documents across 1175 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 1175 files of CC-MAIN-2026-08 (22,723,411 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 1175 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~952.4 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 2.7 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~48.2 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 32.5 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 2.7 TB of uncompressed HTML down to 102.5 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 68.3%.
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End to end: ~952.4 GB of raw gzipped WARCs becomes **32.5 GB of Parquet** — a **96.6% total reduction** — containing 22,723,411 clean markdown documents.
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### Processing Times
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Pipeline timings across 1175 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 83h 38m 18s avg 4m 16s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 5h 48m 17s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 20h 13m 14s avg 1m 1s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 7h 45m 47s avg 23s
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```
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### Dataset Charts
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data/CC-MAIN-2026-08/05265.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:30761523c646d859b88b93ebf9042faa26facad3853f6220dbb61b82fc46eae8
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size 29053804
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stats.csv
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@@ -1119,6 +1119,7 @@ CC-MAIN-2026-08,5261,19347,2558592345,89527934,27720362,2026-03-14T01:40:57Z,164
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| 1119 |
CC-MAIN-2026-08,5262,19588,2556389989,94280356,29543187,2026-03-14T01:44:12Z,164,0,31,94
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CC-MAIN-2026-08,5263,19441,2558886288,94815301,30187800,2026-03-14T01:49:12Z,261,0,27,8
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| 1121 |
CC-MAIN-2026-08,5264,19734,2588505976,94208771,30036112,2026-03-14T01:52:42Z,165,0,46,32
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| 1122 |
CC-MAIN-2026-08,5492,19488,2577487663,95676086,30636918,2026-03-14T01:06:35Z,267,0,18,18
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CC-MAIN-2026-08,5493,19631,2592234390,91001440,28842612,2026-03-14T01:19:12Z,181,0,28,9
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CC-MAIN-2026-08,5494,19345,2580777219,94618705,30365899,2026-03-14T01:19:12Z,155,0,49,9
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| 1151 |
CC-MAIN-2026-08,5764,19367,2591610596,94532864,29661916,2026-03-14T01:48:27Z,227,0,19,9
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CC-MAIN-2026-08,5765,19306,2578123993,92688820,28898102,2026-03-14T01:50:57Z,127,0,18,10
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CC-MAIN-2026-08,5766,19457,2590983694,97938795,30727431,2026-03-14T01:53:27Z,122,0,21,26
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-
CC-MAIN-2026-08,5767,19335,2577058163,96338664,29168429,2026-03-14T01:55:57Z,131,0,18,
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CC-MAIN-2026-08,5992,19427,2553319561,93689821,30257425,2026-03-14T01:06:35Z,197,0,31,18
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CC-MAIN-2026-08,5993,19504,2561761288,95284868,30935071,2026-03-14T01:19:12Z,205,0,28,9
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CC-MAIN-2026-08,5994,19299,2541522096,89680113,28640562,2026-03-14T01:19:12Z,206,0,21,9
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CC-MAIN-2026-08,5262,19588,2556389989,94280356,29543187,2026-03-14T01:44:12Z,164,0,31,94
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CC-MAIN-2026-08,5263,19441,2558886288,94815301,30187800,2026-03-14T01:49:12Z,261,0,27,8
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CC-MAIN-2026-08,5264,19734,2588505976,94208771,30036112,2026-03-14T01:52:42Z,165,0,46,32
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+
CC-MAIN-2026-08,5265,19828,2604085939,95442973,29053804,2026-03-14T01:56:12Z,179,0,36,0
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| 1123 |
CC-MAIN-2026-08,5492,19488,2577487663,95676086,30636918,2026-03-14T01:06:35Z,267,0,18,18
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CC-MAIN-2026-08,5493,19631,2592234390,91001440,28842612,2026-03-14T01:19:12Z,181,0,28,9
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CC-MAIN-2026-08,5494,19345,2580777219,94618705,30365899,2026-03-14T01:19:12Z,155,0,49,9
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CC-MAIN-2026-08,5764,19367,2591610596,94532864,29661916,2026-03-14T01:48:27Z,227,0,19,9
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CC-MAIN-2026-08,5765,19306,2578123993,92688820,28898102,2026-03-14T01:50:57Z,127,0,18,10
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CC-MAIN-2026-08,5766,19457,2590983694,97938795,30727431,2026-03-14T01:53:27Z,122,0,21,26
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CC-MAIN-2026-08,5767,19335,2577058163,96338664,29168429,2026-03-14T01:55:57Z,131,0,18,13
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CC-MAIN-2026-08,5992,19427,2553319561,93689821,30257425,2026-03-14T01:06:35Z,197,0,31,18
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| 1157 |
CC-MAIN-2026-08,5993,19504,2561761288,95284868,30935071,2026-03-14T01:19:12Z,205,0,28,9
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| 1158 |
CC-MAIN-2026-08,5994,19299,2541522096,89680113,28640562,2026-03-14T01:19:12Z,206,0,21,9
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