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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1897) Define SignalContainerRequest and SignalContainerResponse
Date Wed, 21 May 2014 00:48:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-1897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14004166#comment-14004166
] 

Ming Ma commented on YARN-1897:
-------------------------------

Chatted with Gera offline. The definition of SignalContainer* APIs is needed for other subtasks
including YARN-1515. So we will resolve SignalContainer* APIs issues in this jira. After it
is done, other subtasks can continue. Here are couple open issues.

1.  Support for a list of containers. The latest patch in this jira just supports a flat list
of signalContainerRequest, regardless if they are from the same containers or not. Gera's
patch in YARN-1515 groups all commands under the same container together via signalContainerRequest.getSignals().
Either approach works. I don't have strong preference either way given the most common use
case is for single container; although signalContainers is more consistent with startContainers.

2. Support for "SIGTERM + delay + SIGKILL" used in stopContainers. Latest YARN-1515 introduces
"Pause" method so that containers can pause in between signals. We need something like that
to support YARN-1515 scenario. Or we can provide some new SignalContainerCommand like "sleep".

Really appreciate any comments on this.

> Define SignalContainerRequest and SignalContainerResponse
> ---------------------------------------------------------
>
>                 Key: YARN-1897
>                 URL: https://issues.apache.org/jira/browse/YARN-1897
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: YARN-1897-2.patch, YARN-1897-3.patch, YARN-1897-4.patch, YARN-1897.1.patch
>
>
> We need to define SignalContainerRequest and SignalContainerResponse first as they are
needed by other sub tasks. SignalContainerRequest should use OS-independent commands and provide
a way to application to specify "reason" for diagnosis. SignalContainerResponse might be empty.



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