[jira] [Assigned] (YARN-9237) RM prints a lot of "Cannot get RMApp by appId" log when RM failover

["Jiandan Yang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-9237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jiandan Yang  reassigned YARN-9237:
-----------------------------------

    Assignee: Jiandan Yang 

> RM prints a lot of "Cannot get RMApp by appId" log when RM failover
> -------------------------------------------------------------------
>
>                 Key: YARN-9237
>                 URL: https://issues.apache.org/jira/browse/YARN-9237
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>            Reporter: Jiandan Yang 
>            Assignee: Jiandan Yang 
>            Priority: Major
>         Attachments: YARN-9237.001.patch
>
>
> I found a lot of following log in active RM log file after doing  failover RM
> {code:java}
> 2019-01-24 15:43:58,999 WARN org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl: Cannot get RMApp by appId=application_1542178952162_34746156, just added it to finishedApplications list for cleanup
> .....
> {code}
> I looked forward RM logs and find this app had finished before hours
> {code:java}
> 2019-01-23 21:49:55,683 INFO org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl: appattempt_1542178952162_34746156_000001 State change from FINAL_SAVING to FINISHING
> {code}
> The reason of RM prints " Cannot get RMApp by appId"  is as follows:
> 1. RM failover
> 2. NM reports all running apps to RM in register request
> 3. The running apps are from NMContext, some apps may already finished
> 4. In my cluster, yarn.log-aggregation-enable=false, yarn.nodemanager.log.retain-seconds=86400(1day), so app is kept in NMContext before app has finished for 24 hours
> 5. My Yarn cluster runs 50k apps per day and 7k nodes, and NM will report many finished apps to RM.



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