Publish 3 shards CC-MAIN-2026-08/02123–03084
Browse files- README.md +12 -12
- data/CC-MAIN-2026-08/02123.parquet +3 -0
- data/CC-MAIN-2026-08/02581.parquet +3 -0
- data/CC-MAIN-2026-08/03084.parquet +3 -0
- stats.csv +4 -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 **13,
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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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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~
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| HTML extracted (uncompressed) | 1.6 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~28.
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| Final Parquet (Zstd level 19) | 19.
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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 1.6 TB of uncompressed HTML down to 60.
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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 36h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 1h 50m 33s avg 9s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 8h
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ total 5h 17m
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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 **13,449,563 documents across 696 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 696 files of CC-MAIN-2026-08 (13,449,563 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 696 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~564.1 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 1.6 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~28.5 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 19.3 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 1.6 TB of uncompressed HTML down to 60.6 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: ~564.1 GB of raw gzipped WARCs becomes **19.3 GB of Parquet** — a **96.6% total reduction** — containing 13,449,563 clean markdown documents.
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### Processing Times
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Pipeline timings across 696 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 36h 36m 11s avg 3m 9s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 1h 50m 33s avg 9s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 8h 9m 21s avg 42s
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ total 5h 17m 24s avg 27s
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```
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### Dataset Charts
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data/CC-MAIN-2026-08/02123.parquet
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data/CC-MAIN-2026-08/02581.parquet
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size 29606440
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data/CC-MAIN-2026-08/03084.parquet
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version https://git-lfs.github.com/spec/v1
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size 30315303
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stats.csv
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@@ -588,7 +588,7 @@ CC-MAIN-2026-08,1926,19426,2551882370,97586983,30989565,2026-03-13T14:53:07Z,549
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-
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@@ -611,6 +611,7 @@ CC-MAIN-2026-08,2119,19379,2611089681,96465671,30746524,2026-03-13T13:42:10Z,120
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@@ -652,6 +653,7 @@ CC-MAIN-2026-08,2577,19462,2557070263,93094054,29372008,2026-03-13T14:58:29Z,606
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@@ -689,6 +691,7 @@ CC-MAIN-2026-08,3080,19474,2578457542,92757252,29282324,2026-03-13T14:45:01Z,388
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