Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/120#issuecomment-37477894
The goal isn't to replace Spark's names with YARN's names, but rather to be
consistent with the terminology used in the rest of Spark. "Master" refers to
the service in Spark standalone mode that brokers resources for the entire
cluster, and "worker" refers to the daemons running on each machine that are
responsible for starting executors. Using these words to mean what Spark
normally calls "driver" and "executor" can cause confusion.
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