Re: Hadoop call graph generator

[Steve Loughran <st...@apache.org>]

On 05/27/2011 11:58 PM, Aishwarya Venkataraman wrote:
> Hello,
>
> I am a newbie dev. I would like to generate a call graph for Hadoop inorder
> to understand the control flow better. Is there something that an help me do
> this or merely changing the log level to debug alone might help ?
>
> Thanks,
> Aishwarya
>

There's a trick Log4J where you can get the logger to push out the class 
and method making a log call -add

%c.%M()

to your logg pattern, e.g

log4j.appender.stdout.layout.ConversionPattern=%d{DATE} %-5p [%t] 
%c.%M() -- %m%n

Nobody uses this in production as it causes a stack trace to be created 
for every logging op, but it's good for tracking down problems, or here, 
getting an understanding of what goes where