tadija

/*
*** Academy Engraved LET ***
AcademyEngravedLetPlain
---------------------
*** Al Nile ***
AlNile
AlNile-Bold
---------------------
*** American Typewriter ***
AmericanTypewriter

xmzhao

http://www.thecloudavenue.com/2011/11/passing-parameters-to-mappers-and.html

There might be a requirement to pass additional parameters to the mapper and reducers, besides the the inputs which they process. Lets say we are interested in Matrix multiplication and there are multiple ways/algorithms of doing it. We could send an input parameter to the mapper and reducers, based on which the appropriate way/algorithm is picked. There are multiple ways of doing this

Setting the parameter:

1. Use the -D command line option to set the parameter while running the job.

2. Before launching the job using the old MR API