mapred.jobtracker.retirejob.interval

[Manhee Jo]

Hi,

When I ran a job (containing some hundreds of thousands tasks) over our 
hadoop-0.19.2 cluster, I got OutOfMemoryError at JobTracker. Monitoring 
memory usage at the JobTracker with Ganglia, it looks like that memory space 
of the JobTracker is released every 24 hours, which is the default value of 
mapred.jobtracker.retirejob.interval.
What happens if I set mapred.jobtracker.retirejob.interval to any less 
values like 12 hours or even 0? Does it only control job retirement interval 
from JobTrackers memory? Any ohter side effects can you suppose?


Thanks.
Manhee