FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A TaskTracker is a slave node daemon in the cluster that accepts tasks (Map, Reduce and Shuffle operations) from a JobTracker. There is only One Task Tracker process run on any hadoop slave node. Task Tracker runs on its own JVM process.

Detailed explanation-2: -TaskTracker: TaskTracker is again a MapReduce Daemon. It is a Slave Pro-cess. Within a cluster there can be multiple TaskTracker. It is the responsibility of the TaskTracker to execute all the tasks assigned by the JobTracker.

Detailed explanation-3: -JobTracker is a daemon which runs on Apache Hadoop’s MapReduce engine. JobTracker is an essential service which farms out all MapReduce tasks to the different nodes in the cluster, ideally to those nodes which already contain the data, or at the very least are located in the same rack as nodes containing the data.

Detailed explanation-4: -Hadoop Job Tacker Job Tracker is the master daemon for both Job resource management and scheduling/monitoring of jobs. It acts as a liaison between Hadoop and your application.

Detailed explanation-5: -Basically, daemons in computing term is a pro-cess that runs in the background. So Hadoop framework is having five such daemons that runs in the background to store this huge amount of data and process it. Out of these five, three daemons are of HDFS and two daemons are of MapRe-duce.