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Hadoop, mail # dev - MultithreadedMapper


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Re: MultithreadedMapper
Doug Cutting 2012-07-26, 18:08
On Thu, Jul 26, 2012 at 7:42 AM, Robert Evans <[EMAIL PROTECTED]> wrote:
> About the only time that
> MultiThreaded mapper makes a lot of since is if there is a lot of
> computation associated with each key/value pair.

Or if the mapper does a lot of i/o to some external resource, e.g., a
web crawler.

Doug