Database Reference
In-Depth Information
Figure 7-3. How status updates are propagated through the MapReduce system
Job Completion
When the application master receives a notification that the last task for a job is complete,
it changes the status for the job to “successful.” Then, when the
Job
polls for status, it
learns that the job has completed successfully, so it prints a message to tell the user and
then returns from the
waitForCompletion()
method. Job statistics and counters are
printed to the console at this point.
