I am running 3 job trackers so 1 is active and other 2 will be in standby, so if one job tracker goes down how another job tracker gets active from standby...
asked 20 Jan '12, 00:17
Warden is responsible for launching a replacement JobTracker on one of the other standby nodes. Warden leverages ZooKeeper to make sure that there's always one active JobTracker in the cluster. The TaskTrackers will automatically connect to the new JobTracker and report the status of all tasks that are running or have completed.
answered 20 Jan '12, 00:20