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https://issues.apache.org/jira/browse/YARN-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544319#comment-13544319
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Bikas Saha commented on YARN-308:
---------------------------------
Sorry for not being clear. ResourceRequests are host location dependent. Which
means that every time we change the requests for a given location (priority
etc) then we dont send the delta value. We send the absolute value of the
request. Sorry for the confusion. Like Jason clearly explains, pure delta is
open to races and pure absolute has high communication cost.
> Improve documentation about what "asks" means in AMRMProtocol
> -------------------------------------------------------------
>
> Key: YARN-308
> URL: https://issues.apache.org/jira/browse/YARN-308
> Project: Hadoop YARN
> Issue Type: Bug
> Components: api, resourcemanager
> Affects Versions: 2.0.2-alpha
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Fix For: 2.0.3-alpha
>
> Attachments: YARN-308.patch
>
>
> It's unclear to me from reading the javadoc exactly what "asks" means when
> the AM sends a heartbeat to the RM. Is the AM supposed to send a list of all
> resources that it is waiting for? Or just inform the RM about new ones that
> it wants?
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