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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-445) Ability to signal containers
Date Tue, 05 Nov 2013 00:30:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13813463#comment-13813463
] 

Sandy Ryza commented on YARN-445:
---------------------------------

In 0.21, when a task was going to be killed due to timeout, a SIGQUIT would be sent to it
to dump its stacks to standard out (MAPREDUCE-1119).  This was a useful feature that I'm currently
working on backporting to branch-1 in MAPREDUCE-5592.  It would be good to make sure that
whatever we do here can accommodate something similar.

> 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: YARN-445--n2.patch, YARN-445--n3.patch, YARN-445--n4.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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