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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4325) Purge app state from NM state-store should cover more LOG_HANDLING cases
Date Tue, 10 May 2016 23:24:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-4325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15279212#comment-15279212

Junping Du commented on YARN-4325:

Thanks [~jlowe] for comments. I agree that adding a boolean flag may not be a very decent
solution. However, given APPLICATION_LOG_HANDLING_FAILED event could be sent when app is still
running, we have to cache this event (in boolean flag or some other way) so later we can do
app cleanup when app is finished. 
Do we have better way to achieve this?

> Purge app state from NM state-store should cover more LOG_HANDLING 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
>         Attachments: ApplicationImpl.PNG, YARN-4325-v1.1.patch, YARN-4325-v1.patch, YARN-4325.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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