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From "Joris Rau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-2213) CommonCrawlDataDumper saves gzipped body in extracted form
Date Thu, 11 Feb 2016 10:02:18 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-2213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15142493#comment-15142493
] 

Joris Rau commented on NUTCH-2213:
----------------------------------

Hui. It seems there are a lot of people interested in this issue now. Thanks for the fast
help and replies.

[~chrismattmann] I am not using Nutch and am therefore not interested in developing the CommonCrawlDataDumper
tool. But thanks for the invitation ;) .

> CommonCrawlDataDumper saves gzipped body in extracted form
> ----------------------------------------------------------
>
>                 Key: NUTCH-2213
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2213
>             Project: Nutch
>          Issue Type: Bug
>          Components: commoncrawl, dumpers
>            Reporter: Joris Rau
>            Assignee: Julien Nioche
>            Priority: Critical
>              Labels: easyfix
>
> I have downloaded [a WARC file|https://aws-publicdatasets.s3.amazonaws.com/common-crawl/crawl-data/CC-MAIN-2015-40/segments/1443738099622.98/warc/CC-MAIN-20151001222139-00240-ip-10-137-6-227.ec2.internal.warc.gz]
from the common crawl data. This file contains several gzipped responses which are stored
plaintext (without the gzip encoding).
> I used [warctools|https://github.com/internetarchive/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|https://github.com/internetarchive/warctools/pull/14#issuecomment-182048962]).
warctools uses a more up to date version of hanzo warctools which is recommended on the [Common
Crawl website|https://commoncrawl.org/the-data/get-started/] under "Processing the file format".
> I have not been using Nutch and can therefore not say which versions are affected by
this.
> After reading [the official WARC draft|http://archive-access.sourceforge.net/warc/warc_file_format-0.9.html]
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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