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From "GOEKE, MATTHEW (AG/1000)" <matthew.go...@monsanto.com>
Subject RE: Submitting a Hadoop task from withing a reducer
Date Tue, 04 Oct 2011 16:11:00 GMT

Is yarn just a synonym for MRv2? And if so he would still have to create a custom application
master for his job type right?


-----Original Message-----
From: Joey Echeverria [mailto:joey@cloudera.com] 
Sent: Tuesday, October 04, 2011 11:06 AM
To: mapreduce-user@hadoop.apache.org
Subject: Re: Submitting a Hadoop task from withing a reducer

You may want to check out Yarn, coming in Hadoop 0.23:



On Tue, Oct 4, 2011 at 11:45 AM, Yaron Gonen <yaron.gonen@gmail.com> wrote:
> Hi,
> Hadoop tasks are always stacked to form a linear user-managed workflow (a
> reduce step cannot start before all previous mappers have stopped etc). This
> may be problematic in recursive tasks: for example in a BFS we will not get
> any output until the longest branch has been reached.
> In order to solve than, an idea came up of submitting a whole Hadoop task
> from within a reducer. Have anyone tried it?
> Thanks.

Joseph Echeverria
Cloudera, Inc.
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