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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-341) Enhance distcp to handle *http* as a 'source protocol'.
Date Mon, 17 Jul 2006 18:35:14 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-341?page=comments#action_12421686 ] 
            
Arun C Murthy commented on HADOOP-341:
--------------------------------------

I have a further enhancement to distcp i.e. -f option now works with urls of scheme http/dfs/file.
 Hence I'm reopening this issue and will submit another patch shortly.

Doug, I'll also update logalyzer (HADOOP-342) to reflect these changes and another patch there
will be needed too, please hold off commits there.

thanks,
Arun

> Enhance distcp to handle *http* as a 'source protocol'.
> -------------------------------------------------------
>
>                 Key: HADOOP-341
>                 URL: http://issues.apache.org/jira/browse/HADOOP-341
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: util
>            Reporter: Arun C Murthy
>             Fix For: 0.5.0
>
>         Attachments: distcp.patch, distcp2.patch
>
>
> Requirements:
>   Presently distcp recursively copies a directory from one dfs to another i.e. both source
and destination of of the *dfs* protocol.
>   Enhance it to handle *http* as the source protocol i.e. support copying files from
arbitrary http-based sources into the dfs.
> Design:
>   
>   Follow distcp's current design: one map task per file which needs to be copied.
>   Caveat: distcp handles *recursive* copying by listing sub-directories; this is not
as feasible with a http-based source since things like 'fancy-indexing' might not be enabled
on the web-server (for all sub-locations recursively too), and even if it is enabled it will
mean tedious parsing of the html served to glean the sub-directories etc. Hence the idea is
to support an input file (via a -f option) which contains a list of the http-based urls which
represent multiple source files.

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