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From "Hitesh Shah (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-445) Ability to signal containers
Date Fri, 07 Mar 2014 23:50:52 GMT

    [ https://issues.apache.org/jira/browse/YARN-445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13924508#comment-13924508

Hitesh Shah commented on YARN-445:

bq. I would like to create a ticket for SIGKILL only since this is the easiest one. We can
still use SignalContainerRequest and SignalContainerResponse. Also, we can create a enum type
called SignalContainerCMD which can contains SIGKILL, SIGTERM, etc.

[~xgong] [~mingma] What does a default signal number 3 imply on Windows? Also, have you figured
out what the entries in the enum will map to for Windows? 


> 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
>            Assignee: Andrey Klochkov
>         Attachments: MRJob.png, MRTasks.png, YARN-445--n2.patch, YARN-445--n3.patch,
YARN-445--n4.patch, YARN-445.patch, YARNContainers.png
> 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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