Publish shard CC-MAIN-2026-08/01936
Browse files- README.md +11 -11
- data/CC-MAIN-2026-08/01936.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 **14,
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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) | 1.7 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~30.
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| Final Parquet (Zstd level 19) | 20.7 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 1.7 TB of uncompressed HTML down to 65.
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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 41h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 1h 50m 33s avg 8s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 9h
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ total 5h 34m
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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 **14,480,434 documents across 749 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 749 files of CC-MAIN-2026-08 (14,480,434 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 749 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~607.1 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 1.7 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~30.7 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 20.7 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 1.7 TB of uncompressed HTML down to 65.3 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: ~607.1 GB of raw gzipped WARCs becomes **20.7 GB of Parquet** — a **96.6% total reduction** — containing 14,480,434 clean markdown documents.
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### Processing Times
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Pipeline timings across 749 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 41h 38m 14s avg 3m 20s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 1h 50m 33s avg 8s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 9h 2m 13s avg 43s
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ total 5h 34m 24s avg 26s
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```
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### Dataset Charts
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data/CC-MAIN-2026-08/01936.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:6bd4d11e59bb20afcd8669f1a719d3dfd9ac7c376301e32d401fb001c71c3966
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size 29691200
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stats.csv
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@@ -623,6 +623,7 @@ CC-MAIN-2026-08,1932,19369,2564301103,93801517,29242281,2026-03-13T15:46:56Z,546
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CC-MAIN-2026-08,1933,19248,2579893230,98704471,31093153,2026-03-13T15:59:11Z,598,0,126,11
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CC-MAIN-2026-08,1934,19550,2574323484,90960336,28636735,2026-03-13T16:02:56Z,206,0,23,30
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CC-MAIN-2026-08,1935,19304,2592135602,98430951,30753776,2026-03-13T16:08:26Z,239,0,81,12
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CC-MAIN-2026-08,2101,19421,2568457366,93149947,28748313,2026-03-13T13:54:07Z,262,0,31,0
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CC-MAIN-2026-08,2102,19717,2608848648,96373346,30639542,2026-03-13T14:00:38Z,281,0,109,0
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CC-MAIN-2026-08,2103,19325,2580718688,94798987,30249683,2026-03-13T14:06:18Z,304,0,34,0
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@@ -714,7 +715,7 @@ CC-MAIN-2026-08,2824,19187,2537556792,92083965,29727470,2026-03-13T15:46:33Z,498
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| 714 |
CC-MAIN-2026-08,2825,19533,2582104096,95896575,30321794,2026-03-13T15:52:41Z,305,0,64,12
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CC-MAIN-2026-08,2826,19519,2588031935,96747984,30634522,2026-03-13T16:00:26Z,393,0,80,23
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CC-MAIN-2026-08,1934,19550,2574323484,90960336,28636735,2026-03-13T16:02:56Z,206,0,23,30
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CC-MAIN-2026-08,1935,19304,2592135602,98430951,30753776,2026-03-13T16:08:26Z,239,0,81,12
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CC-MAIN-2026-08,1936,19524,2587346278,94370630,29691200,2026-03-13T16:13:56Z,314,0,26,0
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CC-MAIN-2026-08,2101,19421,2568457366,93149947,28748313,2026-03-13T13:54:07Z,262,0,31,0
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CC-MAIN-2026-08,2102,19717,2608848648,96373346,30639542,2026-03-13T14:00:38Z,281,0,109,0
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CC-MAIN-2026-08,2103,19325,2580718688,94798987,30249683,2026-03-13T14:06:18Z,304,0,34,0
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CC-MAIN-2026-08,2825,19533,2582104096,95896575,30321794,2026-03-13T15:52:41Z,305,0,64,12
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CC-MAIN-2026-08,2827,19399,2545980437,91425550,29777608,2026-03-13T16:08:56Z,467,0,35,13
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CC-MAIN-2026-08,2828,19552,2560245417,89820454,28768898,2026-03-13T16:12:41Z,193,0,39,11
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CC-MAIN-2026-08,3052,19289,2581535769,95779278,29412368,2026-03-13T12:27:59Z,0,0,0,5
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CC-MAIN-2026-08,3053,19208,2553598556,93105627,29687407,2026-03-13T12:27:59Z,0,0,0,5
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