Publish 12 shards CC-MAIN-2026-12/32740–32765
Browse files- README.md +12 -12
- data/CC-MAIN-2026-12/03/27/032740.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032741.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032742.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032743.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032744.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032745.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032760.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032761.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032762.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032763.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032764.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032765.parquet +3 -0
- stats.csv +18 -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 **563,
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### Live Progress
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Processing at **
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Estimated completion: **May
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**Current server:** 6 CPU cores, 12 GB RAM (7.
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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) | ~25.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 72.9 TB | ~223.4 TB | — |
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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 72.9 TB of uncompressed HTML down to 4.7 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: ~25.8 TB of raw gzipped WARCs becomes **1.5 TB of Parquet** — a **94.3% total reduction** — containing 563,
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### Processing Times
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Pipeline timings across
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░
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Convert (HTML → Markdown → Parquet) ████████████████████████ 694h
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Publish (HuggingFace) █████░░░░░░░░░░░░░░░░░░░ 146h
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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 **563,314,794 documents across 32646 shards**. Processed 72.9 TB of raw HTML into 4.7 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 **59.2 shards/hour** — 32,646 of 100,000 done (**32.65%**)
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Estimated completion: **May 22, 2026** (47 days)
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**Current server:** 6 CPU cores, 12 GB RAM (7.2 GB available), 59 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:** 592 shards/hour → April 9, 2026 (5 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 32646 files of CC-MAIN-2026-12 (563,314,794 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 32646 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~25.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 72.9 TB | ~223.4 TB | — |
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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 72.9 TB of uncompressed HTML down to 4.7 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: ~25.8 TB of raw gzipped WARCs becomes **1.5 TB of Parquet** — a **94.3% total reduction** — containing 563,314,794 clean markdown documents.
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### Processing Times
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Pipeline timings across 32646 shards of CC-MAIN-2026-12:
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░ 289h 7m 42s
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Convert (HTML → Markdown → Parquet) ████████████████████████ 694h 31m 38s
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Publish (HuggingFace) █████░░░░░░░░░░░░░░░░░░░ 146h 41m 42s
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```
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### Dataset Charts
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stats.csv
CHANGED
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@@ -32620,9 +32620,15 @@ CC-MAIN-2026-12,32733,17354,2465046670,162525209,50307746,2026-04-04T20:34:23Z,3
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CC-MAIN-2026-12,32734,17670,2515619804,159310121,49722363,2026-04-04T20:38:03Z,41,65,0,28,631
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CC-MAIN-2026-12,32735,17423,2474535051,160095075,50264423,2026-04-04T20:38:03Z,39,74,0,28,587
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CC-MAIN-2026-12,32736,17444,2460412352,163106165,51455666,2026-04-04T20:38:03Z,42,67,0,28,585
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CC-MAIN-2026-12,32737,17400,2487222501,164061132,51751247,2026-04-04T20:42:33Z,38,84,1,
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CC-MAIN-2026-12,32738,17519,2500768711,157764548,49442312,2026-04-04T20:42:33Z,37,70,0,
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CC-MAIN-2026-12,32739,17466,2502888294,162546495,51222282,2026-04-04T20:42:33Z,0,73,1,
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CC-MAIN-2026-12,32750,17344,2511858756,160492183,51527230,2026-04-04T20:31:13Z,43,62,0,23,603
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@@ -32630,6 +32636,12 @@ CC-MAIN-2026-12,32753,17428,2478542641,160720512,50495240,2026-04-04T20:34:23Z,3
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CC-MAIN-2026-12,32763,17501,2475819937,160514442,49861914,2026-04-04T20:49:13Z,40,59,0,0,584
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CC-MAIN-2026-12,32765,17397,2491481259,158065554,49888153,2026-04-04T20:49:13Z,43,58,0,0,522
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