Publish shard CC-MAIN-2026-08/01221
Browse files- README.md +10 -10
- data/CC-MAIN-2026-08/01221.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 **54,
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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) | ~2.2 TB | ~83 TB | — |
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| HTML extracted (uncompressed) | 6.6 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~115.
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| Final Parquet (Zstd level 19) | 78.1 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 6.6 TB of uncompressed HTML down to 246.
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End to end: ~2.2 TB of raw gzipped WARCs becomes **78.1 GB of Parquet** — a **96.6% total reduction** — containing 54,
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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
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 13h 28m 50s avg 17s
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Export (Parquet) ██████░░░░░░░░░░░░░░░░░░ total 65h
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 20h
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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 **54,784,006 documents across 2827 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 2827 files of CC-MAIN-2026-08 (54,784,006 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 2827 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~2.2 TB | ~83 TB | — |
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| HTML extracted (uncompressed) | 6.6 TB | ~295 TB | — |
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| Packed markdown WARC (.md.warc.gz) | ~115.9 GB | ~3.7 TB | **-98.3%** vs HTML |
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| Final Parquet (Zstd level 19) | 78.1 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 6.6 TB of uncompressed HTML down to 246.5 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: ~2.2 TB of raw gzipped WARCs becomes **78.1 GB of Parquet** — a **96.6% total reduction** — containing 54,784,006 clean markdown documents.
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### Processing Times
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Pipeline timings across 2827 shards of CC-MAIN-2026-08:
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```
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Download (raw WARC) ████████████████████████ total 253h 7m 45s avg 5m 22s
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Convert (HTML → MD) █░░░░░░░░░░░░░░░░░░░░░░░ total 13h 28m 50s avg 17s
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Export (Parquet) ██████░░░░░░░░░░░░░░░░░░ total 65h 26m 16s avg 1m 23s
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Publish (HuggingFace) █░░░░░░░░░░░░░░░░░░░░░░░ total 20h 11m 33s avg 25s
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```
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### Dataset Charts
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data/CC-MAIN-2026-08/01221.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:f333514060cc7dd3731275945291834b83c9b772912697713b2b5f7cf28482d2
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size 30134703
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stats.csv
CHANGED
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@@ -1171,6 +1171,7 @@ CC-MAIN-2026-08,1217,19300,2567371247,94394181,30120577,2026-03-14T22:46:08Z,669
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@@ -1351,7 +1352,7 @@ CC-MAIN-2026-08,1426,19299,2575534591,96994155,29846650,2026-03-14T22:46:08Z,607
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