Publish shard CC-MAIN-2026-08/00386
Browse files- README.md +9 -9
- data/CC-MAIN-2026-08/00386.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 **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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| 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) | ~55.
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| Final Parquet (Zstd level 19) | 37.6 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 118.
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End to end: ~1.1 TB of raw gzipped WARCs becomes **37.6 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 104h
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 31m 40s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 25h
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 8h 20m 14s 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 **26,260,015 documents across 1358 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 1358 files of CC-MAIN-2026-08 (26,260,015 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 1358 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) | ~55.7 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 37.6 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 118.4 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: ~1.1 TB of raw gzipped WARCs becomes **37.6 GB of Parquet** — a **96.6% total reduction** — containing 26,260,015 clean markdown documents.
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### Processing Times
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Pipeline timings across 1358 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 104h 57m 35s avg 4m 38s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 7h 31m 40s avg 19s
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Export (Parquet) █████░░░░░░░░░░░░░░░░░░░ total 25h 53m 4s avg 1m 8s
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 8h 20m 14s avg 22s
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```
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data/CC-MAIN-2026-08/00386.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 sha256:9397b5e5dde43c5746659ff5ab6223b78392d1bd48c5500dc33880e56c90b006
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size 29138445
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stats.csv
CHANGED
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@@ -361,6 +361,7 @@ CC-MAIN-2026-08,382,19506,2559479883,92929783,29749683,2026-03-14T03:07:32Z,642,
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CC-MAIN-2026-08,383,19480,2585608034,96499906,30256523,2026-03-14T03:17:23Z,491,0,92,24
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| 362 |
CC-MAIN-2026-08,384,19452,2547739751,97352105,31344501,2026-03-14T03:27:24Z,417,0,208,30
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| 363 |
CC-MAIN-2026-08,385,19387,2602298891,92854602,30321533,2026-03-14T03:38:05Z,478,0,158,17
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| 364 |
CC-MAIN-2026-08,401,19441,2586676962,94334130,29618260,2026-03-13T11:41:00Z,0,0,33,0
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| 365 |
CC-MAIN-2026-08,402,19446,2552785517,96654791,30560442,2026-03-13T11:49:21Z,0,443,57,0
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CC-MAIN-2026-08,403,19320,2579048144,91406292,29341198,2026-03-13T11:56:46Z,0,414,29,0
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CC-MAIN-2026-08,383,19480,2585608034,96499906,30256523,2026-03-14T03:17:23Z,491,0,92,24
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CC-MAIN-2026-08,384,19452,2547739751,97352105,31344501,2026-03-14T03:27:24Z,417,0,208,30
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| 363 |
CC-MAIN-2026-08,385,19387,2602298891,92854602,30321533,2026-03-14T03:38:05Z,478,0,158,17
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+
CC-MAIN-2026-08,386,19305,2557218730,90919663,29138445,2026-03-14T03:49:53Z,494,0,219,0
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CC-MAIN-2026-08,401,19441,2586676962,94334130,29618260,2026-03-13T11:41:00Z,0,0,33,0
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CC-MAIN-2026-08,402,19446,2552785517,96654791,30560442,2026-03-13T11:49:21Z,0,443,57,0
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CC-MAIN-2026-08,403,19320,2579048144,91406292,29341198,2026-03-13T11:56:46Z,0,414,29,0
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