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I am trying to programatically determine which task attempts run on which tasktracker in my cluster when submitting map reduce jobs to hadoop. I have found that I can get most of the task data from the JobClient like so:
jobClient.getMapTaskReports(jobID)
but not the hostname of the machine that a task attempt succeeded on. Does anybody know how to get the hostname from the task attempt id?
The JobClient gives you a so called NetworkedJob when submitting. It has a method called
getTaskCompletionEvents.That returns you an array of
TaskCompletionEventthat happened, those contain the HTTP address of the tasktracker that ran a task.From that point you can parse the host from the URL.