Xuan 120f3a0ff9 YARN-4438. Implement RM leader election with curator. Contributed by Jian He
(cherry picked from commit 89022f8d4bac0e9d0b848fd91e9c4d700fe1cdbe)
(cherry picked from commit 2cbbf76c3dd9570e08914077de8e610d93ee0c9e)

Conflicts:

	hadoop-yarn-project/CHANGES.txt
2016-12-13 13:30:15 -08:00
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