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https://issues.apache.org/jira/browse/YARN-3639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brahma Reddy Battula resolved YARN-3639.
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Resolution: Fixed
> It takes too long time for RM to recover all apps if the original active RM
> and NN go down at the same time.
> ------------------------------------------------------------------------------------------------------------
>
> 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 active RM and NN go down at the same time, 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 NN, the result of which is
> time-out after 10~20s, and then the client tries to connect to the new NN.
> The entire recovery cost 15*#apps seconds according our test.
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