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From Keith Wiley <kwi...@keithwiley.com>
Subject Re: Hadoop in Eclipse
Date Tue, 08 May 2012 18:13:33 GMT
Seconded. In Eclipse, I create a new empty Java project, then import as an external jar the
core hadoop jar. That's it. It'll then offer code completion and online code checking as you
type. To build my code I use ant on the command line and a build.xml file that I derived from
the hadoop build.xml, but vastly simplified. I run the driver jar locally which then runs
M/R either locally or on a cluster...or I can upload the jar to Azure...or presumably AWS
although I haven't worked with that cloud yet.

The Hadoop core jar should get you going.

Sent from my phone, please excuse my brevity.
Keith Wiley, kwiley@keithwiley.com, http://keithwiley.com

Jagat <jagatsingh@gmail.com> wrote:


If you are looking to setup eclipse just to write mappers and reducers for
your code then

Create a eclipse java project
Download Apache bundle of Hadoop from Apache hadoop website
If you are using Hadoop 0.23 then go to share folder and add all those jars
e.g mapreduce , hdfs etc into project build path
If you are using Hadoop 1.x or 0,20 series then jars are present right
inside the home folder so you can directly add them to build path

Just run the main class which is your driver for your mapper and reducer
and remember to use job.setJarByClass method

Hope this helps.

On Tue, May 8, 2012 at 3:40 AM, Wilson Wayne - wwilso <
Wayne.Wilson@acxiom.com> wrote:

> I’m new to Hadoop and am trying to get it setup in Eclipse. I’m
> following the “Working with Hadoop under Eclipse” wiki to do this. First
> let me make sure this will do what I am hoping it will do. I’m not so much
> interested in modifying the Hadoop code itself (although I may in the not
> too distant future). I’m more looking to be able to code and test mappers
> and reducers in Eclipse and leverage the debugging and other tools in
> Eclipse in that process. If that’s not what the wiki is describing than
> let me know that and ignore my issue. If there is a way to do this, would
> you please point me to where I can find the instructions. If this is what
> the wiki is describing than I have an issue I need help with.****
> ** **
> I’ve followed the directions on the Wiki and even worked through a couple
> of issues by searching the archive. However, now I’ve hit an error that
> while I did find it in the archive, the fix that was presented is not
> fixing my issue. After importing all the projects, I get a build error:
> “Project ‘MapReduceTools’ is missing required library:
> ‘lib/hadoop-core.jar’”. I’ve added the M2_REPO variable as someone
> suggested in the archive where I found this error once. That hasn’t fixed
> or even changed the error. I’ve looked in my maven repository
> (c:\Users\wwilso\.m2\repository) and there is not a “Hadoop-core.jar”
> anywhere in the repository that windows explorer can find. In fact,
> windows explorer can’t find a “Hadoop-core.jar” anywhere on my c:\ drive.
> ****
> ** **
> I did my build using the directions from the wiki (got source using git in
> cygwin and then executing the two maven commands in cywgin). I did use the
> patch for the “scripts/saveVersion.sh” not found error to resolve that
> issue. That’s the only thing I have changed from the wiki or code. Using
> Maven-3.0.4, ant-1.8.3, and protobuf-2.4.1. Anyone have any ideas? Thanks
> in advance.****
> ** **
> ** **
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