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March 26, 2014

March 2014 Crawl Data Now Available

Note: this post has been marked as obsolete.
The March crawl of 2014 is now available! The new dataset contains approximately 2.8 billion webpages and is about 223TB in size.
Common Crawl Foundation
Common Crawl Foundation
Common Crawl - Open Source Web Crawling data‍

The March crawl of 2014 is now available! The new dataset contains approximately 2.8 billion webpages and is about 223TB in size. The new data is located in the commoncrawl bucket at /crawl-data/CC-MAIN-2014-10/

We went a little deeper on this crawl than during our 2013 crawls so you'll see more pages per domain.

Data Type File List #Files Total Size
Compressed (TiB)
Segments segment.paths.gz 557
WARC warc.paths.gz 55700 33.19
WAT wat.paths.gz 55699 11.43
WET wet.paths.gz 55699 4.01
URL index files cc-index.paths.gz 302 0.14
Columnar URL index files cc-index-table.paths.gz 300 0.15

We're working hard to get a few machines always crawling domains with large numbers of pages to go even deeper while still maintaining our politeness policy.

Thanks again to Blekko for their ongoing donation of URLs for our crawl.

This release was authored by:
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Erratum: 

Charset Detection Bug in WET Records

Originally reported by: 
Javier de la Rosa
Permalink

The charset detection required to properly transform non-UTF-8 HTML pages in WARC files into WET records didn't work before November 2016 due to a bug in IIPC Web Archive Commons (see the related issue in the CC fork of Apache Nutch).  There should be significantly fewer errors in all subsequent crawls. Originally discussed here in Google Groups.

Erratum: 

Missing Language Classification

Originally reported by: 
Permalink

Starting with crawl CC-MAIN-2018-39 we added a language classification field (‘content-languages’) to the columnar indexes, WAT files, and WARC metadata for all subsequent crawls. The CLD2 classifier was used, and includes up to three languages per document. We use the ISO-639-3 (three-character) language codes.