Publish shard CC-MAIN-2026-08/06259
Browse files- README.md +11 -11
- data/CC-MAIN-2026-08/06259.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 **23,
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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) | 2.8 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~49.5 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 33.
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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 2.8 TB of uncompressed HTML down to 105.
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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 86h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 5h 48m 17s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 20h
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 7h 56m
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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 **23,366,539 documents across 1208 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 1208 files of CC-MAIN-2026-08 (23,366,539 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 1208 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~979.1 GB | ~83 TB | — |
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| HTML extracted (uncompressed) | 2.8 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~49.5 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 33.5 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 2.8 TB of uncompressed HTML down to 105.4 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: ~979.1 GB of raw gzipped WARCs becomes **33.5 GB of Parquet** — a **96.6% total reduction** — containing 23,366,539 clean markdown documents.
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### Processing Times
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Pipeline timings across 1208 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 86h 38m 55s avg 4m 18s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 5h 48m 17s avg 17s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 20h 56m 25s avg 1m 2s
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Publish (HuggingFace) ██░░░░░░░░░░░░░░░░░░░░░░ total 7h 56m 34s avg 23s
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```
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### Dataset Charts
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data/CC-MAIN-2026-08/06259.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:ecda583a14bc0111af54c9797433b4b226df82eba30aafd1f3d32d04865a09cc
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size 28570963
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stats.csv
CHANGED
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@@ -1197,7 +1197,7 @@ CC-MAIN-2026-08,6005,19283,2551192479,92601555,28655787,2026-03-14T01:06:35Z,458
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| 1197 |
CC-MAIN-2026-08,6006,19454,2592942389,96124717,29612115,2026-03-14T01:06:35Z,484,0,166,18
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| 1198 |
CC-MAIN-2026-08,6007,19516,2579008548,88879017,28677500,2026-03-14T02:04:06Z,325,0,67,22
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| 1199 |
CC-MAIN-2026-08,6008,19428,2583397224,95592254,29667259,2026-03-14T02:10:27Z,309,0,104,9
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| 1200 |
-
CC-MAIN-2026-08,6009,19700,2583100469,93563400,29004030,2026-03-14T02:17:08Z,279,0,117,
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| 1201 |
CC-MAIN-2026-08,6250,19502,2594302344,89411296,28384540,2026-03-13T17:51:21Z,406,0,120,0
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| 1202 |
CC-MAIN-2026-08,6251,19394,2555453090,92793633,28885378,2026-03-14T01:06:36Z,709,0,233,18
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| 1203 |
CC-MAIN-2026-08,6252,19389,2566928631,91567909,28780284,2026-03-14T01:06:36Z,515,0,174,18
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CC-MAIN-2026-08,6256,19464,2582836141,91935326,29465805,2026-03-14T01:06:36Z,462,0,192,18
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| 1208 |
CC-MAIN-2026-08,6257,19407,2579094476,91783125,29610503,2026-03-14T02:03:27Z,320,0,68,38
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| 1209 |
CC-MAIN-2026-08,6258,19629,2598324527,93363027,30124510,2026-03-14T02:10:27Z,310,0,109,9
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| 1197 |
CC-MAIN-2026-08,6006,19454,2592942389,96124717,29612115,2026-03-14T01:06:35Z,484,0,166,18
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| 1198 |
CC-MAIN-2026-08,6007,19516,2579008548,88879017,28677500,2026-03-14T02:04:06Z,325,0,67,22
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| 1199 |
CC-MAIN-2026-08,6008,19428,2583397224,95592254,29667259,2026-03-14T02:10:27Z,309,0,104,9
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| 1200 |
+
CC-MAIN-2026-08,6009,19700,2583100469,93563400,29004030,2026-03-14T02:17:08Z,279,0,117,29
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| 1201 |
CC-MAIN-2026-08,6250,19502,2594302344,89411296,28384540,2026-03-13T17:51:21Z,406,0,120,0
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| 1202 |
CC-MAIN-2026-08,6251,19394,2555453090,92793633,28885378,2026-03-14T01:06:36Z,709,0,233,18
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| 1203 |
CC-MAIN-2026-08,6252,19389,2566928631,91567909,28780284,2026-03-14T01:06:36Z,515,0,174,18
|
|
|
|
| 1207 |
CC-MAIN-2026-08,6256,19464,2582836141,91935326,29465805,2026-03-14T01:06:36Z,462,0,192,18
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| 1208 |
CC-MAIN-2026-08,6257,19407,2579094476,91783125,29610503,2026-03-14T02:03:27Z,320,0,68,38
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| 1209 |
CC-MAIN-2026-08,6258,19629,2598324527,93363027,30124510,2026-03-14T02:10:27Z,310,0,109,9
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| 1210 |
+
CC-MAIN-2026-08,6259,19456,2565500983,89320522,28570963,2026-03-14T02:17:38Z,298,0,109,0
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