The crawl archive for July/August 2021 is now available! The data was crawled July 23 – August 6 and contains 3.15 billion web pages or 360 TiB of uncompressed content. It includes page captures of 1 billion new URLs, not visited in any of our prior crawls.
Improvements
Archiving of robots.txt files was improved. Robots.txt files are not archived if
- the robots.txt of the target host does not allow it (in case of a HTTP redirect) or
- URL filters exclude the entire site, eg. if it's known ahead that a site does not allow crawling or
- the MIME type is not applicable for robots.txt files (eg. HTML, PDF)
More details are found in the corresponding issue report. The change reduces the size of the robots.txt subset (since August 2016) by removing content which should not contained in this dataset.
Archive Location and Download
The July/August crawl archive is located in the commoncrawl bucket at crawl-data/CC-MAIN-2021-31/.
To assist with exploring and using the dataset, we provide gzipped files which list all segments, WARC, WAT and WET files.
By simply adding either s3://commoncrawl/ or https://data.commoncrawl.org/ to each line, you end up with the S3 and HTTP paths respectively.
The Common Crawl URL Index for this crawl is available at: https://index.commoncrawl.org/CC-MAIN-2021-31/. Also the columnar index has been updated to contain this crawl.
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Erratum:
Erroneous title field in WAT records
The "Title" extracted in WAT records to the JSON path `Envelope > Payload-Metadata > HTTP-Response-Metadata > HTML-Metadata > Head > Title` is not the content included in the <title> element in the HTML header (<head> element) if the page contains further <title> elements in the page body. The content of the last <title> element is written to the WAT "Title". This bug was observed if the HTML page includes embedded SVG graphics.
The issue was reported by the user Robert Waksmunski:
- https://groups.google.com/g/common-crawl/c/ZrPFdY3pPA4/m/s5D_8wCJAAAJ
- WAT extractor: Document title bug ia-web-commons#36
...and was fixed for CC-MAIN-2024-42 by commoncrawl/ia-web-commons#37.
This erratum affects all crawls from CC-MAIN-2013-20 until CC-MAIN-2024-38.
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