That is a stale property in log4j.properties that isn't used for anything. 
There are other such things like noKeepSplits, purgeLogSplits etc which seem to 
be stale too.

mapred.userlog.retain.hours should work just fine as Harsh correctly mentioned.

HTH,
+Vinod


On Dec 7, 2011, at 2:48 AM, Sahana Bhat wrote:

> Was my assumption that "hadoop.tasklog.logsRetainHours " in log4j.properties 
> will do the same wrong? What is this property for in that case?
> 
> Regards,
> Sahana
> 

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