There have been a number of issues in the RM with relation to ZooKeeper connections. There is at least a couple of issue fixed in CDH 5.3.3 (YARN-3242, YARN-2992). I am not sure if your case is fully covered by these fixes since we are still working on one or two fixes in this area but upgrading to CDH 5.3.3 will help with a number of these ZK issues in the RM. Wilfred
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