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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-445) Ability to signal containers
Date Mon, 15 Apr 2013 20:56:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632178#comment-13632178
] 

Bikas Saha commented on YARN-445:
---------------------------------

IMO it would be great if the API allows YARN/NM to figure out what is the intended action.
That way the NM can perform that action using the Shell which makes the OS transparent. Simply
passing a signal value integer with YARN/NM just being a pass through may not be the right
thing. I am not quite sure how to handle Java specific behavior.
                
> 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
>    Affects Versions: 2.0.5-beta
>            Reporter: Jason Lowe
>
> 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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