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From Bo Sang <sampl...@gmail.com>
Subject Re: How to insert some print codes into Hadoop?
Date Wed, 23 Mar 2011 18:00:21 GMT
Thanks very much for your reply. But if I would like to modify Hadoop source
code, how could I achieve this goal?

On Wed, Mar 23, 2011 at 1:40 PM, Konstantin Boudnik <cos@apache.org> wrote:

> [Moving to common-user@, Bcc'ing general@]
>
> If you know where you need to have your print statements you can use
> AspectJ to do runtime injection of needed java code into desirable
> spots. You don't need to even touch the source code for that - just
> instrument (weave) the jar file
> --
>   Take care,
> Konstantin (Cos) Boudnik
>
> On Tue, Mar 22, 2011 at 09:19, Bo Sang <samplise@gmail.com> wrote:
> > Hi, guys:
> >
> > I would like to do some minor modification of Hadoop (just to insert some
> > print codes into particular places). And I have the following questions:
> >
> > 1. It seems there are three parts of Hadoop: common, hdfs, mapred. And
> they
> > are packed as three independent jar packages. Could I only modify one
> part
> > (eg, common) and pack a new jar package without modifying the rest two.
> >
> > 2. I have try to import the folder hadoop-0.21.0/common into eclipse as a
> > project. But eclipse fails to recognize it as an existing project. But if
> I
> > import folder hadoop-0.21.0 as a existing project, it works. However, I
> only
> > want to modify common part. How could I only modify  common part and
> export
> > a new common jar package without modifying the rest two parts.
> >
> > --
> > Best Regards!
> >
> > Sincerely
> > Bo Sang
> >
>



-- 
Best Regards!

Sincerely
Bo Sang

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