The crawl archive for December 2016 is now available! The archive is located in the commoncrawl bucket at crawl-data/CC-MAIN-2016-50/. It contains more than 2.85 billion web pages. Similar to the preceding September and October crawls, we used sitemaps to find new URLs for already known hosts shortly before the crawl was launched. In addition to the top-million domains from Alexa, sitemaps were mined for a list of multi-lingual sites. Thanks to the Statistical Machine Translation Group at the University of Edinburgh, which created this resource and made it available. We hope to have greater coverage of multi-lingual content in this and future crawls.
We are also grateful to webxtrakt for the continued donation of verified, DNS-resolvable domain names of European country-code TLDs (.eu, .fr, .be, .de, .ch, .nl, .pl, .ru, .dk).
To assist with exploring and using the dataset, we provide gzipped files that list:
- all segments (CC-MAIN-2016-50/segment.paths.gz)
- all WARC files (CC-MAIN-2016-50/warc.paths.gz)
- all WAT files (CC-MAIN-2016-50/wat.paths.gz)
- all WET files (CC-MAIN-2016-50/wet.paths.gz)
- robots.txt files (CC-MAIN-2016-50/robotstxt.paths.gz)
- non-200 HTTP status code responses (CC-MAIN-2016-50/non200responses.paths.gz)
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-2016-50/. Note that the index now contains robots.txt responses and URLs that have not been successfully fetched (i.e. 404's and pages with HTTP status codes other than 200). For more information on working with the URL index, please refer to the previous blog post or the Index Server API. There is also a command-line tool client for common use cases of the URL index. Please donate to Common Crawl if you appreciate our free datasets! We’re also seeking corporate sponsors to partner with Common Crawl for our non-profit work in open data. Please contact info@commoncrawl.org for sponsorship information and packages.
Erratum:
WAT data: repeated WARC and HTTP headers are not preserved
Repeated HTTP and WARC headers were not represented in the JSON data in WAT files. When a header was repeated adding a further value of that header, only the last value was stored and other values were lost. This issues was fixed with CC-MAIN-2024-51, see ia-web-commons#18. All WAT files from CC-MAIN-2013-20 until CC-MAIN-2024-46 are affected.
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.
Erratum:
Incorrect fetch_time metadata
In crawls CC-MAIN-2016-36 to CC-MAIN-2016-50, and CC-MAIN-2018-34 to CC-MAIN-2019-47 the fetch_time metadata for robots.txt might be incorrect. The correct times can be found in collinfo.json. See the related issue (commoncrawl/nutch#14) for more information.
Erratum:
Missing Language Classification
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.
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