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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5621) Support LinuxContainerExecutor to create symlinks for continuously localized resources
Date Mon, 19 Sep 2016 18:04:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504180#comment-15504180
] 

Chris Douglas commented on YARN-5621:
-------------------------------------

bq. this approach will not work in rollback scenario, as in that case no resources need to
be localized - hence, no need to start the localizer processes. We only need to update the
symlinks to old resources.

Sorry, I'm missing something. If the {{ContainerLocalizer}} supports a command to create symlinks
to localized resources- a case that already exists for containers on the same node requesting
the same resource- then how is that case distinguished from rollback? The container does need
to start a {{ContainerLocalizer}} just to write some symlinks for the running container, which
is inefficient. On the other hand, all symlinks for all containers from an application could
be updated in the same invocation. When you say it does not work, are you noting the inefficiency
of this flow, or is there a correctness problem?

> Support LinuxContainerExecutor to create symlinks for continuously localized resources
> --------------------------------------------------------------------------------------
>
>                 Key: YARN-5621
>                 URL: https://issues.apache.org/jira/browse/YARN-5621
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-5621.1.patch, YARN-5621.2.patch, YARN-5621.3.patch, YARN-5621.4.patch,
YARN-5621.5.patch
>
>
> When new resources are localized, new symlink needs to be created for the localized resource.
This is the change for the LinuxContainerExecutor to create the symlinks.



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