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BIG Data, Hadoop – Chapter 4 - Hadoop Daemons

The back end components of Hadoop system can be visualized as shown below.











Name Node and Data Node will be explained in detail in my next blog.

All these Daemons are nothing but a piece of code. Java code is running at the background. In order to run Java Code, we need JVM, So each daemon service need some JVM service to run.

Job Tracker- Any operation can be considered as a Job, example Read a text file is a job. This is handled by Job Tracker.

Task tracker- A job can have many tasks. Like connection to file is one of the task, Reading the data is other task, displaying/processing the data is another task. These are managed by Task Tracker.
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