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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-417) Add a poller that allows the AM to receive notifications when it is assigned containers
Date Mon, 25 Feb 2013 18:14:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586070#comment-13586070

Sandy Ryza commented on YARN-417:

Sorry, good point.  The patch is a work in progress and any feedback, especially from those
who have built AMs, would be greatly appreciated.  The patch defines a simple Heartbeater,
which spawns a thread to sends heartbeats to the AM at a user-defined interval.  The user
uses AMRMClient to submit its resource requests, and the Heartbeater uses it to ship off these
requests on the next heartbeat.

The Heartbeater takes a user-implemented AllocationListener (maybe need a better name?), which
supports three callbacks:
allocationResponse - called on every heartbeat with the full response from the RM
containersCompleted - called when the RM returns containers completed with a list of ContainerStatuses
containersAllocated - called when the RM returns containers for use with a list of Containers

I hope that makes things a little clearer.
> Add a poller that allows the AM to receive notifications when it is assigned containers
> ---------------------------------------------------------------------------------------
>                 Key: YARN-417
>                 URL: https://issues.apache.org/jira/browse/YARN-417
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, applications
>    Affects Versions: 2.0.3-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: YARN-417.patch
> Writing AMs would be easier for some if they did not have to handle heartbeating to the
RM on their own.

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