Hi, I'm currently using HDP 2.4.3-0.227 and testing it's H-A capabilities. But I'm encountering a slow failover problem. My RM is deployed on my namenode2 and namenode1 using QJM H-A thanks to Ambari. I'm first executing a job with terasort : hadoop jar /usr/hdp/current/hadoop-mapreduce-client/hadoop-mapreduce-examples-2.7.1.2.4.3.0-227.jar terasort random-data6 sorted-data36 then shutting down the machine with active RM, the job will stuck a few seconds after and block for around 15 minutes. After these 15 minutes, it will start again and finish with success. H-A is working but it is obviously too slow for production. I found an issue similar and better described than me on apache website : https://issues.apache.org/jira/browse/YARN-2578 But I'm not sure how to apply the patch and don't think it is a good idea at first because of the target version. Do anybody met this problem before and solved it using this patch or something else ? ... View more