Xianyin Xin created YARN-3639:

             Summary: It takes too long time for RM to recover all apps if the 
original active RM and namenode is deployed on the same node.
                 Key: YARN-3639
                 URL: https://issues.apache.org/jira/browse/YARN-3639
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
            Reporter: Xianyin Xin
            Assignee: Xianyin Xin

If the node on which the active RM runs dies and if the active namenode is 
running on the same node, the new RM will take long time to recover all apps. 
After analysis, we found the root cause is renewing HDFS tokens in the 
recovering process. The HDFS client created by the renewer would firstly try to 
connect to the original namenode, the result of which is time-out after 10~20s, 
and then the client tries to connect to the new namenode. The entire recovery 
cost 15*#apps seconds according our test.

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