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Explain Job Scheduling Through Jobtracker? |
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Answer» JobTracker communicates with NameNode to identify data LOCATION and submits the work to TaskTracker NODE. The TaskTracker plays a major role as it notifies the JobTracker for any job failure. It actually is referred to the heartbeat reporter reassuring the JobTracker that it is still alive. Later, the JobTracker is responsible for the ACTIONS as in it MAY either resubmit the job or MARK a specific record as unreliable or blacklist it. JobTracker communicates with NameNode to identify data location and submits the work to TaskTracker node. The TaskTracker plays a major role as it notifies the JobTracker for any job failure. It actually is referred to the heartbeat reporter reassuring the JobTracker that it is still alive. Later, the JobTracker is responsible for the actions as in it may either resubmit the job or mark a specific record as unreliable or blacklist it. |
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