(1) I declared a global variable in my hadoop mainClass which gets initialized in the 'run' function of this mainClass. When I try to access this global static variable from the MapperClass, it appears to be uninitialized.
Why is that? Is it because of the parallel execution of Hadoop functions ? but , isn't the 'run' function supposed to be the one to run first and prepare all the job configurations before the Maps even start?
(2) Fig 4.5 in http://developer.yahoo.com/hadoop/tutorial/module4.html shows the inputFormat to be the one running before the maps. My question is in which node? The JobTracker node?