Publish shard CC-MAIN-2026-08/00745
Browse files- README.md +9 -9
- data/CC-MAIN-2026-08/00745.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 **55,
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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) | ~2.3 TB | ~83 TB | — |
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| HTML extracted (uncompressed) | 6.7 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~117.
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| Final Parquet (Zstd level 19) | 79.1 GB | ~2.9 TB | **-32.5%** 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 6.7 TB of uncompressed HTML down to 249.
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End to end: ~2.3 TB of raw gzipped WARCs becomes **79.1 GB of Parquet** — a **96.6% total reduction** — containing 55,
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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 258h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 13h 28m 50s avg 16s
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Export (Parquet) ██████░░░░░░░░░░░░░░░░░░ total 66h
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 20h 29m 5s 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 **55,447,158 documents across 2861 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 2861 files of CC-MAIN-2026-08 (55,447,158 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 2861 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~2.3 TB | ~83 TB | — |
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| HTML extracted (uncompressed) | 6.7 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~117.3 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 79.1 GB | ~2.9 TB | **-32.5%** 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 6.7 TB of uncompressed HTML down to 249.5 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: ~2.3 TB of raw gzipped WARCs becomes **79.1 GB of Parquet** — a **96.6% total reduction** — containing 55,447,158 clean markdown documents.
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### Processing Times
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Pipeline timings across 2861 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 258h 29m 6s avg 5m 25s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 13h 28m 50s avg 16s
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Export (Parquet) ██████░░░░░░░░░░░░░░░░░░ total 66h 54m 22s avg 1m 24s
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 20h 29m 5s avg 25s
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```
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data/CC-MAIN-2026-08/00745.parquet
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@@ -0,0 +1,3 @@
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version https://git-lfs.github.com/spec/v1
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oid sha256:5fc5d3ee5a1597308f99a5f09dc1112479ae41452b0bd5ccd2e97b020b6f3207
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size 28841794
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stats.csv
CHANGED
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@@ -745,6 +745,7 @@ CC-MAIN-2026-08,741,19382,2570241665,94898311,30073507,2026-03-13T12:01:53Z,223,
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| 745 |
CC-MAIN-2026-08,742,19342,2528635925,95412615,30958373,2026-03-15T00:14:23Z,396,0,246,24
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| 746 |
CC-MAIN-2026-08,743,19277,2524411290,92591808,28946298,2026-03-15T00:25:08Z,463,0,181,23
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| 747 |
CC-MAIN-2026-08,744,19523,2583383020,99207389,31204304,2026-03-15T00:32:53Z,270,0,190,17
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| 748 |
CC-MAIN-2026-08,750,19471,2557384086,90848659,29734352,2026-03-13T17:41:16Z,435,0,70,21
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| 749 |
CC-MAIN-2026-08,751,19477,2574917221,91998519,29309299,2026-03-13T17:50:02Z,452,0,71,18
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| 750 |
CC-MAIN-2026-08,752,19489,2571204645,97532082,30423490,2026-03-13T18:03:30Z,520,0,60,7
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| 745 |
CC-MAIN-2026-08,742,19342,2528635925,95412615,30958373,2026-03-15T00:14:23Z,396,0,246,24
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| 746 |
CC-MAIN-2026-08,743,19277,2524411290,92591808,28946298,2026-03-15T00:25:08Z,463,0,181,23
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| 747 |
CC-MAIN-2026-08,744,19523,2583383020,99207389,31204304,2026-03-15T00:32:53Z,270,0,190,17
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+
CC-MAIN-2026-08,745,19419,2557807607,93689269,28841794,2026-03-15T00:44:30Z,513,0,186,0
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| 749 |
CC-MAIN-2026-08,750,19471,2557384086,90848659,29734352,2026-03-13T17:41:16Z,435,0,70,21
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| 750 |
CC-MAIN-2026-08,751,19477,2574917221,91998519,29309299,2026-03-13T17:50:02Z,452,0,71,18
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| 751 |
CC-MAIN-2026-08,752,19489,2571204645,97532082,30423490,2026-03-13T18:03:30Z,520,0,60,7
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