Publish shard CC-MAIN-2026-08/01336
Browse files- README.md +9 -9
- data/CC-MAIN-2026-08/01336.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 **25,
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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) | ~1.
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| HTML extracted (uncompressed) | 3.1 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~54.4 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 36.7 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 3.1 TB of uncompressed HTML down to 115.
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End to end: ~1.
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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 102h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 15m 22s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 25h
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 8h 13m 53s 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 **25,655,575 documents across 1327 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 1327 files of CC-MAIN-2026-08 (25,655,575 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 1327 files (measured) | 100,000 files (projected) | Reduction |
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| Raw WARC (.warc.gz, downloaded) | ~1.1 TB | ~83 TB | — |
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| HTML extracted (uncompressed) | 3.1 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~54.4 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 36.7 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 3.1 TB of uncompressed HTML down to 115.7 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 68.3%.
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End to end: ~1.1 TB of raw gzipped WARCs becomes **36.7 GB of Parquet** — a **96.6% total reduction** — containing 25,655,575 clean markdown documents.
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### Processing Times
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Pipeline timings across 1327 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 102h 37m 3s avg 4m 38s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 15m 22s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 25h 5m 1s avg 1m 8s
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 8h 13m 53s avg 22s
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```
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data/CC-MAIN-2026-08/01336.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 sha256:553387a1445cd57b79d0c769fc48dcb5e77ad5d44b24a34a62de0be803136342
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size 29226498
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stats.csv
CHANGED
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@@ -897,6 +897,7 @@ CC-MAIN-2026-08,1332,19240,2578734476,96883680,30443777,2026-03-14T02:47:02Z,569
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| 897 |
CC-MAIN-2026-08,1333,19398,2611873016,95906282,30349927,2026-03-14T02:58:59Z,477,0,61,31
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| 898 |
CC-MAIN-2026-08,1334,19616,2625127244,98361569,30410115,2026-03-14T03:10:17Z,666,0,95,14
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| 899 |
CC-MAIN-2026-08,1335,19445,2547826342,94548063,29547506,2026-03-14T03:19:19Z,483,0,116,15
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| 900 |
CC-MAIN-2026-08,1401,19441,2586676962,94334130,29606093,2026-03-13T09:50:34Z,230,0,90,0
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| 901 |
CC-MAIN-2026-08,1402,19641,2571912489,94392153,29376558,2026-03-13T10:21:08Z,1035,0,797,0
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| 902 |
CC-MAIN-2026-08,1403,19445,2589553842,99835858,31697837,2026-03-13T10:51:00Z,1248,0,530,0
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| 897 |
CC-MAIN-2026-08,1333,19398,2611873016,95906282,30349927,2026-03-14T02:58:59Z,477,0,61,31
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| 898 |
CC-MAIN-2026-08,1334,19616,2625127244,98361569,30410115,2026-03-14T03:10:17Z,666,0,95,14
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| 899 |
CC-MAIN-2026-08,1335,19445,2547826342,94548063,29547506,2026-03-14T03:19:19Z,483,0,116,15
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| 900 |
+
CC-MAIN-2026-08,1336,19440,2570626453,93069186,29226498,2026-03-14T03:32:28Z,676,0,145,0
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| 901 |
CC-MAIN-2026-08,1401,19441,2586676962,94334130,29606093,2026-03-13T09:50:34Z,230,0,90,0
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| 902 |
CC-MAIN-2026-08,1402,19641,2571912489,94392153,29376558,2026-03-13T10:21:08Z,1035,0,797,0
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| 903 |
CC-MAIN-2026-08,1403,19445,2589553842,99835858,31697837,2026-03-13T10:51:00Z,1248,0,530,0
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