Zheyi, The jobtracker doesn't keep a reference to the job to save memory, but you may still find it in the filesystem. For a default CDH3 installation, it will be in the jobtracker's local filesystem, at /var/log/hadoop-0.20/history/done/
Logs from individual tasks are a little trickier to find. They will be in the node that ran that task, at /var/log/hadoop-0.20/history/userlogs if they haven't been deleted yet -- deletion is controled by mapreduce.job.userlog.retain.hours, and the default is 24 hours. Regards, Marcos I would like to ask why the logs (configurations and status) of my job disappeared in the Jobtracker web UI? Specifically, I finished a job four days ago, but I cannot find it in the Jobtracker web UI, neither in the homepage nor "Job Tracker History" on the left-bottom corner. The cluster is deployed with CDH3, and users actively submit jobs. Some configurations: mapred.jobtracker.retirejob.interval 3600000 mapred.jobtracker.completeuserjobs.maximum 5
