Publish 5 shards CC-MAIN-2026-12/16222–16454
Browse files- README.md +13 -13
- charts/timing_chart.png +2 -2
- charts/totals_chart.png +2 -2
- data/CC-MAIN-2026-12/01/62/016222.parquet +3 -0
- data/CC-MAIN-2026-12/01/63/016310.parquet +3 -0
- data/CC-MAIN-2026-12/01/63/016359.parquet +3 -0
- data/CC-MAIN-2026-12/01/64/016404.parquet +3 -0
- data/CC-MAIN-2026-12/01/64/016454.parquet +3 -0
- stats.csv +11 -6
README.md
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**Open Markdown** is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Common Crawl is a non-profit that crawls the web and freely provides its archives and datasets to the public — see [their latest crawl announcement](https://commoncrawl.org/blog/march-2026-crawl-archive-now-available) for details on the source data. Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown, and packages the result into Parquet files with useful WARC metadata for traceability.
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The dataset currently includes crawl **CC-MAIN-2026-12** with **277,
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### Live Progress
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Processing at **
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Estimated completion: **April
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**Current server:** 6 CPU cores, 12 GB RAM (3.7 GB available),
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**Memory per session:** avg 578 MB, peak 799 MB (measured via VmRSS)
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**With 10 identical servers:**
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**Open Markdown** 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) | ~12.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 36.0 TB | ~222.5 TB | — |
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| Markdown (clean text) | 2.3 TB | ~6.8 TB | **-96.9%** vs HTML |
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| Final Parquet (Zstd) | 745.
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The big win is HTML → Markdown conversion: the tokenizer strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 36.0 TB of uncompressed HTML down to 2.3 TB of markdown — a **96.9% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~12.8 TB of raw gzipped WARCs becomes **745.
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### Processing Times
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Pipeline timings across
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░ 154h
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Convert (HTML → Markdown → Parquet) ████████████████████████ 376h
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ 60h
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```
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### Dataset Charts
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**Open Markdown** is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Common Crawl is a non-profit that crawls the web and freely provides its archives and datasets to the public — see [their latest crawl announcement](https://commoncrawl.org/blog/march-2026-crawl-archive-now-available) for details on the source data. Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown, and packages the result into Parquet files with useful WARC metadata for traceability.
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The dataset currently includes crawl **CC-MAIN-2026-12** with **277,892,167 documents across 16192 shards**. Processed 36.0 TB of raw HTML into 2.3 TB of clean Markdown — a **96.9% reduction**. We plan to add more snapshots over time.
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### Live Progress
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Processing at **152.0 shards/hour** — 16,192 of 100,000 done (**16.19%**)
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Estimated completion: **April 19, 2026** (23 days)
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**Current server:** 6 CPU cores, 12 GB RAM (3.7 GB available), 102 GB disk free
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**Memory per session:** avg 578 MB, peak 799 MB (measured via VmRSS)
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**With 10 identical servers:** 1520 shards/hour → March 29, 2026 (2 days)
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**Open Markdown** 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 16192 files of CC-MAIN-2026-12 (277,892,167 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 16192 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~12.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 36.0 TB | ~222.5 TB | — |
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| Markdown (clean text) | 2.3 TB | ~6.8 TB | **-96.9%** vs HTML |
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| Final Parquet (Zstd) | 745.6 GB | ~4.5 TB | **-68.9%** vs markdown |
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The big win is HTML → Markdown conversion: the tokenizer strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 36.0 TB of uncompressed HTML down to 2.3 TB of markdown — a **96.9% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~12.8 TB of raw gzipped WARCs becomes **745.6 GB of Parquet** — a **94.3% total reduction** — containing 277,892,167 clean markdown documents.
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### Processing Times
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Pipeline timings across 16192 shards of CC-MAIN-2026-12:
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░ 154h 15m 39s
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Convert (HTML → Markdown → Parquet) ████████████████████████ 376h 17m 22s
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ 60h 34m 5s
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```
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### Dataset Charts
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charts/timing_chart.png
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Git LFS Details
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charts/totals_chart.png
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data/CC-MAIN-2026-12/01/62/016222.parquet
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data/CC-MAIN-2026-12/01/63/016310.parquet
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data/CC-MAIN-2026-12/01/64/016404.parquet
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data/CC-MAIN-2026-12/01/64/016454.parquet
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stats.csv
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@@ -16134,7 +16134,8 @@ CC-MAIN-2026-12,16217,17394,2500644041,162154136,49461888,2026-03-26T22:31:00Z,8
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CC-MAIN-2026-12,16404,17399,2489677680,161634605,49561591,2026-03-26T22:43:17Z,138,154,1,0,608
|
| 16175 |
CC-MAIN-2026-12,16450,17559,2505605956,157831218,50417945,2026-03-26T22:33:50Z,85,135,0,9,593
|
| 16176 |
CC-MAIN-2026-12,16451,17206,2465554639,158844073,48158555,2026-03-26T22:36:30Z,0,137,0,11,584
|
| 16177 |
CC-MAIN-2026-12,16452,17630,2508433942,160186808,48683229,2026-03-26T22:39:20Z,136,146,2,10,580
|
| 16178 |
+
CC-MAIN-2026-12,16453,17255,2442040583,154170965,47846010,2026-03-26T22:42:00Z,0,146,1,12,606
|
| 16179 |
+
CC-MAIN-2026-12,16454,17534,2492098437,159857127,49538205,2026-03-26T22:43:17Z,82,155,1,0,607
|