Xianyin Xin updated YARN-3639:
    Attachment: YARN-3639-recovery_log_1_app.txt

Attach recovery log for 1 app. In the log, there's a gap(15s) between two log 
items printed at 02:39:48,998 and 02:40:04,025. Note that TokenRenewer for HIVE 
tokens is not found, but this has nothing to do with the gap. It's HDFS token 
renewing that caused the gap, the reason is just as the {{Description}} states.

> 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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