/**
* A tracker wants to know if any of its Tasks have been closed (because the job completed,
* whether successfully or not)
*/
public synchronized String pollForTaskWithClosedJob(String taskTracker) {
TreeSet taskIds = (TreeSet) trackerToTaskMap.get(taskTracker);
if (taskIds != null) {
for (Iterator it = taskIds.iterator(); it.hasNext(); ) {
String taskId = (String) it.next();
TaskInProgress tip = (TaskInProgress) taskidToTIPMap.get(taskId);
if (tip.shouldCloseForClosedJob(taskId)) {
//
// This is how the JobTracker ends a task at the TaskTracker.
// It may be successfully completed, or may be killed in
// mid-execution.
//
return taskId;
}
}
}
return null;
}
