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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3850) NM fails to read files from full disks which can lead to container logs being lost and other issues
Date Mon, 27 Jul 2015 14:54:06 GMT

    [ https://issues.apache.org/jira/browse/YARN-3850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14642816#comment-14642816
] 

Sangjin Lee commented on YARN-3850:
-----------------------------------

The merge to 2.6.0 is straightforward.

> NM fails to read files from full disks which can lead to container logs being lost and
other issues
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3850
>                 URL: https://issues.apache.org/jira/browse/YARN-3850
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: log-aggregation, nodemanager
>    Affects Versions: 2.7.0
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>            Priority: Blocker
>              Labels: 2.6.1-candidate
>             Fix For: 2.7.1
>
>         Attachments: YARN-3850.01.patch, YARN-3850.02.patch
>
>
> *Container logs* can be lost if disk has become full(~90% full).
> When application finishes, we upload logs after aggregation by calling {{AppLogAggregatorImpl#uploadLogsForContainers}}.
But this call in turns checks the eligible directories on call to {{LocalDirsHandlerService#getLogDirs}}
which in case of disk full would return nothing. So none of the container logs are aggregated
and uploaded.
> But on application finish, we also call {{AppLogAggregatorImpl#doAppLogAggregationPostCleanUp()}}.
This deletes the application directory which contains container logs. This is because it calls
{{LocalDirsHandlerService#getLogDirsForCleanup}} which returns the full disks as well.
> So we are left with neither aggregated logs for the app nor the individual container
logs for the app.
> In addition to this, there are 2 more issues :
> # {{ContainerLogsUtil#getContainerLogDirs}} does not consider full disks so NM will fail
to serve up logs from full disks from its web interfaces.
> # {{RecoveredContainerLaunch#locatePidFile}} also does not consider full disks so it
is possible that on container recovery, PID file is not found.



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