Jian He 8cdcb792a1 YARN-2340. Fixed NPE when queue is stopped during RM restart. Contributed by Rohith Sharmaks
(cherry picked from commit 0d89859b51157078cc504ac81dc8aa75ce6b1782)

(cherry picked from commit 8b398a66ca3728f47363fc8b2fcf7e556e6bbf5a)
(cherry picked from commit 37f1789f419fa741c2fbae9855549d405e856bff)
2015-08-30 20:40:09 -07:00
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