Appendix A. The JobConf Object in Detail
Everything in a job is controlled via the JobConf
object; it is the center of the universe for a MapReduce job. The framework will take the JobConf
object and render it to XML; then all the tasks will load that XML when they start. This section will cover all the relevant methods (as of Hadoop Core 0.19.0) and provide some basic usage examples.
The JobConf
class inherits from the Configuration
class. Because the JobConf
object is the primary interface between the programmer and the framework, I'll detail all methods available to the user of a JobConf
without distinguishing which methods come from the Configuration
base class. I suggest that you create and use only JobConf
objects. By default, a new JobConf ...
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