Publish shard CC-MAIN-2026-08/05295
Browse files- README.md +10 -10
- data/CC-MAIN-2026-08/05295.parquet +3 -0
- stats.csv +4 -3
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 **26,
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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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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~1.1 TB | ~83 TB | — |
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| HTML extracted (uncompressed) | 3.2 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~56.
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| Final Parquet (Zstd level 19) | 37.9 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 3.2 TB of uncompressed HTML down to 119.
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End to end: ~1.1 TB of raw gzipped WARCs becomes **37.9 GB of Parquet** — a **96.6% total reduction** — containing 26,
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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 100h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 32m 56s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 24h
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 8h
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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 **26,518,091 documents across 1370 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 1370 files of CC-MAIN-2026-08 (26,518,091 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 1370 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~1.1 TB | ~83 TB | — |
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| HTML extracted (uncompressed) | 3.2 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~56.2 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 37.9 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 3.2 TB of uncompressed HTML down to 119.5 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 **37.9 GB of Parquet** — a **96.6% total reduction** — containing 26,518,091 clean markdown documents.
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### Processing Times
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Pipeline timings across 1370 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 100h 20m 31s avg 4m 23s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 32m 56s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 24h 52m 3s avg 1m 5s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 8h 40m 10s avg 22s
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```
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### Dataset Charts
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data/CC-MAIN-2026-08/05295.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:677feef7e46e3af5330337db9b66a7b5835a95d2d39ade8dd374c8b883473ec8
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size 29076719
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stats.csv
CHANGED
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@@ -1190,7 +1190,7 @@ CC-MAIN-2026-08,5041,19567,2619199565,95191414,30001918,2026-03-14T03:41:21Z,169
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| 1190 |
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-
CC-MAIN-2026-08,5045,19616,2573441274,96250261,31220181,2026-03-14T03:56:52Z,157,0,40,
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CC-MAIN-2026-08,5292,19558,2587245145,93664396,29429607,2026-03-14T03:46:56Z,231,0,43,29
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CC-MAIN-2026-08,5293,19771,2611052241,95266714,29860607,2026-03-14T03:50:27Z,188,0,31,16
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CC-MAIN-2026-08,5294,19573,2591086059,91319297,28940203,2026-03-14T03:53:37Z,168,0,20,65
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CC-MAIN-2026-08,5492,19488,2577487663,95676086,30636918,2026-03-14T01:06:35Z,267,0,18,18
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CC-MAIN-2026-08,5493,19631,2592234390,91001440,28842612,2026-03-14T01:19:12Z,181,0,28,9
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@@ -1274,7 +1275,7 @@ CC-MAIN-2026-08,5519,19534,2575459626,94242645,31096280,2026-03-14T03:30:57Z,260
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CC-MAIN-2026-08,5520,19352,2587704211,94359961,30496724,2026-03-14T03:34:57Z,177,0,40,10
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CC-MAIN-2026-08,5522,19481,2578852355,94654827,30014118,2026-03-14T03:47:26Z,301,0,71,7
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CC-MAIN-2026-08,5523,19396,2580850113,92489132,29401281,2026-03-14T03:56:52Z,330,0,94,
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CC-MAIN-2026-08,5751,19431,2573138837,92349969,28828674,2026-03-14T01:06:35Z,813,0,172,18
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CC-MAIN-2026-08,5752,19419,2563830903,92043031,29138030,2026-03-14T01:06:35Z,563,0,128,18
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CC-MAIN-2026-08,6025,19578,2599365824,90303089,29444563,2026-03-14T03:56:52Z,227,0,93,
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CC-MAIN-2026-08,6250,19502,2594302344,89411296,28384540,2026-03-13T17:51:21Z,406,0,120,0
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CC-MAIN-2026-08,6251,19394,2555453090,92793633,28885378,2026-03-14T01:06:36Z,709,0,233,18
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CC-MAIN-2026-08,6252,19389,2566928631,91567909,28780284,2026-03-14T01:06:36Z,515,0,174,18
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CC-MAIN-2026-08,5042,19514,2602120670,94758458,30382663,2026-03-14T03:44:27Z,155,0,30,49
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CC-MAIN-2026-08,5043,19478,2564130344,94088221,30214253,2026-03-14T03:48:42Z,209,0,35,31
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CC-MAIN-2026-08,5044,19398,2560906501,92797300,29145586,2026-03-14T03:52:27Z,176,0,54,69
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CC-MAIN-2026-08,5045,19616,2573441274,96250261,31220181,2026-03-14T03:56:52Z,157,0,40,58
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CC-MAIN-2026-08,5243,19893,2626328731,92220655,29208053,2026-03-14T01:06:34Z,191,0,29,18
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CC-MAIN-2026-08,5244,19395,2572365544,91755759,29356531,2026-03-14T01:19:12Z,222,0,24,9
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CC-MAIN-2026-08,5245,19207,2511351197,90003358,28938970,2026-03-14T01:19:12Z,193,0,22,9
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CC-MAIN-2026-08,5295,19401,2584864586,93148187,29076719,2026-03-14T04:00:08Z,199,0,43,0
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CC-MAIN-2026-08,5523,19396,2580850113,92489132,29401281,2026-03-14T03:56:52Z,330,0,94,58
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CC-MAIN-2026-08,6252,19389,2566928631,91567909,28780284,2026-03-14T01:06:36Z,515,0,174,18
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