Allen Wittenauer commented on YARN-3639:

bq.  "On the same node" means the original active RM and NN were running on the 
same node(node1)

OK, so yes, this still sounds like an irrelevant detail.  It appears the real 
problem here is that if the NN and the RM both go down at the same time 
(+regardless of location+), the RM doesn't use the prior knowledge of the NN 
being down to stream renewal tokens after the new NN is discovered.

> 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
>         Attachments: YARN-3639-recovery_log_1_app.txt
> 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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