[jira] Updated: (HADOOP-341) Enhance distcp to handle *http* as a 'source protocol'.

["Arun C Murthy (JIRA)" <ji...@apache.org>]

     [ http://issues.apache.org/jira/browse/HADOOP-341?page=all ]

Arun C Murthy updated HADOOP-341:
---------------------------------

    Attachment: distcp.patch

Here's a patch which enables distcp to work with http based source files. 

It also provides a -f option to distcp to provide an input file with urls (arbitrary combinations of dfs & http source paths).

> Enhance distcp to handle *http* as a 'source protocol'.
> -------------------------------------------------------
>
>          Key: HADOOP-341
>          URL: http://issues.apache.org/jira/browse/HADOOP-341
>      Project: Hadoop
>         Type: Improvement

>   Components: util
>     Reporter: Arun C Murthy
>  Attachments: distcp.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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