Here are some examples of how to use custom counters: http://www.ashishpaliwal.com/blog/2012/05/hadoop-recipe-using-custom-java-counters/
Regards, Shahab On May 12, 2015 1:29 PM, "Shahab Yunus" <[email protected]> wrote: > Better options than using static variable are, imo: > > One option it use Counters. Check that API. We are using that for values > that are numeric and we need those in the driver once the job finishes. You > can create your custom counters too. > > Other option is (if you need more than just one value or your info is > complicated) then we output data from each mapper or reducer as files in > each task (e.g. in the cleanup method) and then read those once the job > finishes. > > In both of these, you will have to collate and merge, according to the > logic all the copies of the value/info that you end up with. The number of > copies would be equal to the number of mappers or reducers (if you are > keeping the value there) used in the job. > > You can also set the value in the job configuration and read that once the > is over. > > Regards, > Shahab > On May 12, 2015 12:56 PM, "Answer Agrawal" <[email protected]> wrote: > >> Hi, >> >> I declared a variable and incremented/modified it inside Mapper class. >> Now I need to use the modified value of that variable in Driver class. I >> declared a static variable inside Mapper class and its modified value works >> in Driver class when I run the code in Eclipse IDE. But after creating that >> code as a runable jar from Eclipse and run jar file as “$ hadoop jar >> filename.jar input output” modified value does not reflect (value is 0) in >> Driver class. >> >> Thanks, >> >
