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From "Julien Nioche (JIRA)" <>
Subject [jira] [Resolved] (NUTCH-2213) CommonCrawlDataDumper saves gzipped body in extracted form
Date Wed, 10 Feb 2016 10:35:18 GMT


Julien Nioche resolved NUTCH-2213.
    Resolution: Not A Problem

Hi Joris

The WARC files provided by CommonCrawl are currently NOT generated by any Nutch code - and
definitely not the CommonCrawlDataDumper which simply would not scale.

We've recently released a WarcExporter class (which is scalable). The files it generates should
be compliant with the WARC specs, feel free to open an issue if this is not the case.

> CommonCrawlDataDumper saves gzipped body in extracted form
> ----------------------------------------------------------
>                 Key: NUTCH-2213
>                 URL:
>             Project: Nutch
>          Issue Type: Bug
>          Components: commoncrawl, dumpers
>            Reporter: Joris Rau
>            Priority: Critical
>              Labels: easyfix
> I have downloaded [a WARC file|]
from the common crawl data. This file contains several gzipped responses which are stored
plaintext (without the gzip encoding).
> I used [warctools|] from Internet Archive
to extract the responses out of the WARC file. However this tool expects the Content-Length
field to match the actual length of the body in the WARC ([See the issue on github|]).
warctools uses a more up to date version of hanzo warctools which is recommended on the [Common
Crawl website|] under "Processing the file format".
> I have not been using Nutch and can therefore not say which versions are affected by
> After reading [the official WARC draft|]
I could not find out how gzipped content is supposed to be stored. However probably multiple
WARC file parsers will have an issue with this.
> It would be nice to know whether you consider this a bug and plan on fixing this and
whether this is a major issue which concerns most WARC files of the Common Crawl data or only
a small part.

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