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