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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1105) RM or YarnClient to notify AMs if resource requests cannot be satisfied
Date Tue, 27 Aug 2013 20:20:54 GMT

    [ https://issues.apache.org/jira/browse/YARN-1105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751669#comment-13751669

Steve Loughran commented on YARN-1105:

This could be done in the AM by tracking when requests were made & acting when some haven't
been satisfied after a given time period -which implies that the {{AMRMClientAsyncImpl}} could
be extended to do this as it knows what is happening.

However, that will make it stateful, on an AM restart the list of outstanding requests would
be lost, and we can't use {{AMRMClient. getMatchingRequests()}} as you need to know the {{Resource}}
capability you asked for.

> RM or YarnClient to notify AMs if resource requests cannot be satisfied
> -----------------------------------------------------------------------
>                 Key: YARN-1105
>                 URL: https://issues.apache.org/jira/browse/YARN-1105
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: client, nodemanager
>    Affects Versions: 2.1.0-beta
>            Reporter: Steve Loughran
>            Priority: Minor
> Long-lived services may want to know when resource requests can't be satisfied, when
they are stuck in a queue -so that they can cancel them, change the requirements or react
in another applications-specific way

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