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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-445) Ability to signal containers
Date Fri, 11 Oct 2013 05:33:50 GMT

    [ https://issues.apache.org/jira/browse/YARN-445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792357#comment-13792357
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Chris Nauroth commented on YARN-445:
------------------------------------

I haven't had a chance to look at this patch, but I did want to link to MAPREDUCE-5387.  We
have discussed the possibility of using {{SetConsoleCtrlHandler}}/{{GenerateConsoleCtrlEvent}}
to approximate SIGTERM on Windows.  (The current task termination logic on Windows is more
like a SIGKILL.)  Perhaps this patch could be a foundation for that.

> Ability to signal containers
> ----------------------------
>
>                 Key: YARN-445
>                 URL: https://issues.apache.org/jira/browse/YARN-445
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>            Reporter: Jason Lowe
>         Attachments: YARN-445--n2.patch, YARN-445--n3.patch, YARN-445.patch
>
>
> It would be nice if an ApplicationMaster could send signals to contaniers such as SIGQUIT,
SIGUSR1, etc.
> For example, in order to replicate the jstack-on-task-timeout feature implemented by
MAPREDUCE-1119 in Hadoop 0.21 the NodeManager needs an interface for sending SIGQUIT to a
container.  For that specific feature we could implement it as an additional field in the
StopContainerRequest.  However that would not address other potential features like the ability
for an AM to trigger jstacks on arbitrary tasks *without* killing them.  The latter feature
would be a very useful debugging tool for users who do not have shell access to the nodes.



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