Publish 3 shards CC-MAIN-2026-08/00218–01331
Browse files- README.md +11 -11
- data/CC-MAIN-2026-08/00218.parquet +3 -0
- data/CC-MAIN-2026-08/01060.parquet +3 -0
- data/CC-MAIN-2026-08/01331.parquet +3 -0
- stats.csv +3 -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 **23,
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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) | 2.9 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~50.
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| Final Parquet (Zstd level 19) | 34.
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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 2.9 TB of uncompressed HTML down to
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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
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 6h 2m 48s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 22h
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 50m 5s avg 22s
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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 **23,964,949 documents across 1240 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 1240 files of CC-MAIN-2026-08 (23,964,949 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 1240 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~1005.1 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 2.9 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~50.8 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 34.3 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 2.9 TB of uncompressed HTML down to 108.1 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 68.3%.
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End to end: ~1005.1 GB of raw gzipped WARCs becomes **34.3 GB of Parquet** — a **96.6% total reduction** — containing 23,964,949 clean markdown documents.
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### Processing Times
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Pipeline timings across 1240 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 95h 7m 39s avg 4m 36s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 6h 2m 48s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 22h 59m 6s avg 1m 6s
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 50m 5s avg 22s
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```
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data/CC-MAIN-2026-08/00218.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:f157e80560c586db28e3539498b692d27b9b700b30a65250a7bf5a85c020906f
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size 29294264
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data/CC-MAIN-2026-08/01060.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:312619fcccbe7563eecf47d726295ed7342361b93a20fccb86398ea8156f749d
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size 29431896
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data/CC-MAIN-2026-08/01331.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:2732358c245f86d2b6539f9c888f81ee3e3a2a9f09d47668eaa616c15251a679
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size 31188964
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stats.csv
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@@ -218,6 +218,7 @@ CC-MAIN-2026-08,214,19510,2565062520,97415953,31239634,2026-03-14T01:54:46Z,451,
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CC-MAIN-2026-08,215,19662,2653729268,97358767,30868781,2026-03-14T02:03:50Z,478,0,104,20
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CC-MAIN-2026-08,216,19215,2550298655,88185504,27975293,2026-03-14T02:14:50Z,513,0,137,24
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CC-MAIN-2026-08,217,19444,2599076751,94345221,29651768,2026-03-14T02:25:56Z,574,0,99,14
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CC-MAIN-2026-08,250,19200,2541559671,94959737,30214413,2026-03-13T17:42:47Z,511,0,85,19
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CC-MAIN-2026-08,252,19240,2525928701,98163046,31104034,2026-03-13T06:47:10Z,238,0,49,10
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@@ -714,6 +715,7 @@ CC-MAIN-2026-08,1056,19160,2545973799,93816297,29492788,2026-03-14T01:51:50Z,513
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@@ -863,6 +865,7 @@ CC-MAIN-2026-08,1327,19572,2593130174,93784380,30157906,2026-03-13T15:22:03Z,233
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