Publish shard CC-MAIN-2026-08/01041
Browse files- README.md +10 -10
- data/CC-MAIN-2026-08/01041.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) | 2.3 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~40.
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| Final Parquet (Zstd level 19) | 27.2 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 2.3 TB of uncompressed HTML down to 85.
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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 67h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 5h 23m 35s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 57m 45s 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 **18,997,027 documents across 981 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 981 files of CC-MAIN-2026-08 (18,997,027 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 981 files (measured) | 100,000 files (projected) | Reduction |
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| Raw WARC (.warc.gz, downloaded) | ~795.1 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 2.3 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~40.3 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 27.2 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 2.3 TB of uncompressed HTML down to 85.7 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: ~795.1 GB of raw gzipped WARCs becomes **27.2 GB of Parquet** — a **96.6% total reduction** — containing 18,997,027 clean markdown documents.
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### Processing Times
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Pipeline timings across 981 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 67h 35m 2s avg 4m 8s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 5h 23m 35s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 16h 1m 7s avg 58s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 6h 57m 45s avg 25s
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```
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data/CC-MAIN-2026-08/01041.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:c5aa4c2e9c1e237264a54148c34074dd98f5adb60928ba8f3b2fecff89d68f22
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size 29413659
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stats.csv
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@@ -621,6 +621,7 @@ CC-MAIN-2026-08,1037,19526,2569195777,90636673,28214440,2026-03-13T22:23:26Z,569
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CC-MAIN-2026-08,1038,19440,2578280451,90497576,28959891,2026-03-13T22:36:11Z,571,0,189,13
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CC-MAIN-2026-08,1039,19522,2595611358,99643509,31020715,2026-03-13T22:48:03Z,511,0,188,14
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CC-MAIN-2026-08,1040,19468,2614593420,97160239,30460282,2026-03-13T22:59:27Z,491,0,210,15
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| 624 |
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-2026-08,1038,19440,2578280451,90497576,28959891,2026-03-13T22:36:11Z,571,0,189,13
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| 622 |
CC-MAIN-2026-08,1039,19522,2595611358,99643509,31020715,2026-03-13T22:48:03Z,511,0,188,14
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CC-MAIN-2026-08,1040,19468,2614593420,97160239,30460282,2026-03-13T22:59:27Z,491,0,210,15
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CC-MAIN-2026-08,1041,19505,2576608995,93426025,29413659,2026-03-13T23:12:26Z,490,0,279,0
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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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