apache/incubator-spark — pull request #82 by JoshRosen (2013-10-20 02:22:35+00:00)
Title: Split MapOutputTracker into Master/Worker classes

Previously, MapOutputTracker contained fields and methods that were only applicable to the master or worker instances. This commit introduces a MasterMapOutputTracker class to prevent the master-specific methods from being accessed on workers.

I also renamed a few methods, made others protected/private, and made minor logic simplifications in a few places (I'll post some line-comments to explain these changes).