JobTracker

What is JobTracker?

Definition and meaning of JobTracker

JobTracker is a daemon which runs on Apache Hadoop’s MapReduce Engine. JobTracker is an critical provider which farms out all MapReduce duties to the exclusive Nodes in the cluster, ideally to the ones nodes which already incorporate the inFormation, or no less than are located in the equal rack as nodes containing the Data.

What Does JobTracker Mean?

JobTracker is the service inside Hadoop this is responsible for taking Client requests. It assigns them to TaskTrackers on DataNodes where the Records required is locally present. If that isn't viable, JobTracker attempts to assign the obligations to TaskTrackers in the equal rack where the data is locally present. If for some cause this additionally Fails, JobTracker assigns the undertaking to a TaskTracker where a reproduction of the information exists. In Hadoop, data Blocks are replicated across DataNodes to ensure redundancy, in order that if one node within the cluster fails, the job does now not fail as nicely.

JobTracker technique:

1. Job requests from consumer applications are obtained by using the JobTracker,
2. JobTracker consults the NameNode a good way to determine the place of the desired records.
3. JobTracker locates TaskTracker nodes that comprise the facts or at least are close to the facts.
4. The job is submitted to the selected TaskTracker.
5. The TaskTracker plays its obligations at the same time as being closely Monitored via JobTracker. If the process fails, JobTracker surely resubmits the job to another TaskTracker. However, JobTracker itself is a unmarried factor of failure, that means if it fails the entire Device is going down.
6. JobTracker UPDATEs its fame while the process completes.
7. The client requester can now poll facts from JobTracker.

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