spark git commit: [SPARK-4584] [yarn] Remove security manager from Yarn AM.

Repository: spark Updated Branches: refs/heads/master e464f0ac2 - 915f8eeb3 [SPARK-4584] [yarn] Remove security manager from Yarn AM. The security manager adds a lot of overhead to the runtime of the app, and causes a severe performance regression. Even stubbing out all unneeded methods (all

spark git commit: [SPARK-4584] [yarn] Remove security manager from Yarn AM.

Repository: spark Updated Branches: refs/heads/branch-1.2 32198347f - 8cec4312e [SPARK-4584] [yarn] Remove security manager from Yarn AM. The security manager adds a lot of overhead to the runtime of the app, and causes a severe performance regression. Even stubbing out all unneeded methods