Junping Du commented on YARN-4325:

[~mingma] said they hit similar issue in Twitter as well. We may need to 
backport it to 2.7.x as well. CC [~mingma], [~jlowe].

> Nodemanager log handlers fail to send finished/failed events in some cases
> --------------------------------------------------------------------------
>                 Key: YARN-4325
>                 URL: https://issues.apache.org/jira/browse/YARN-4325
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Junping Du
>            Assignee: Junping Du
>            Priority: Critical
>             Fix For: 2.8.0, 3.0.0-alpha1
>         Attachments: ApplicationImpl.PNG, YARN-4325.patch, 
> YARN-4325-v1.1.patch, YARN-4325-v1.patch, YARN-4325-v2.patch, 
> YARN-4325-v3.1.patch, YARN-4325-v3.patch, YARN-4325-v4.1.patch, 
> YARN-4325-v4.patch
> From a long running cluster, we found tens of thousands of stale apps still 
> be recovered in NM restart recovery. 
> After investigating, there are three issues cause app state leak in NM 
> state-store:
> 1. APPLICATION_LOG_HANDLING_FAILED is not handled with remove App in 
> NMStateStore.
> 2. APPLICATION_LOG_HANDLING_FAILED event is missing in sent when hit 
> aggregator's doAppLogAggregation() exception case.
> 3. Only Application in FINISHED status receiving APPLICATION_LOG_FINISHED has 
> transition to remove app in NM state store. Application in other status - 
> like APPLICATION_RESOURCES_CLEANUP will ignore the event and later forget to 
> remove this app from NM state store even after app get finished.

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