Hi all,
Hadoop JobTracker's http info server provides running/failed/completed
job informations on the web through jobtracker.jsp. Lines below show
the logic how the web retries those informations from JobTracker.
JobTracker tracker = (JobTracker) application.getAttribute("job.tracker");
...
Vector<JobInProgress> runningJobs = tracker.runningJobs();
Vector<JobInProgress> completedJobs = tracker.completedJobs();
Vector<JobInProgress> failedJobs = tracker.failedJobs();
Those three methods above are apparently non-thread-safe ones. I am
confused, why the web can safely call a non-thread-safe method of JT?
Thanks,
Min
--
My research interests are distributed systems, parallel computing and
bytecode based virtual machine.
My profile:
http://www.linkedin.com/in/coderplay
My blog:
http://coderplay.javaeye.com
