try this

           <property>
                <name>mapred.map.child.log.level</name>
                <value>DEBUG</value>
            </property>

In case when you launch map reduce from a java action, properties and libs
are not propagated to mapreduce automatically you need to set them in
configuration of mapreduce properly.


On Thu, Feb 6, 2014 at 12:25 AM, Tim Chan <[email protected]> wrote:

> I'm running a map reduce driver class using Oozie's Java action. I can see
> logging for this class, but not for my mapper and reducer classes.
>
> How do I get logging working for the mapper and reducer classes?
>

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