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https://issues.apache.org/jira/browse/YARN-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644626#comment-13644626
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Chris Douglas commented on YARN-45:
-----------------------------------
I'm also a fan of {{ResourceRequest}}, but we're not really using all its
features, yet. Similarly, {{Resource}} bakes in the fungibility of resources,
which could be awkward as the RM accommodates richer requests (as in YARN-392).
We could use {{ResourceRequest}}- so the API is there for extensions- but only
populate the capability as an aggregate. With the convention that "\-1
containers" can mean "packed as you see fit," it expresses {{Resource}} (which
we need in practice, since the priorities for requests don't always [match the
preemption
order|https://issues.apache.org/jira/browse/YARN-569?focusedCommentId=13638825&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13638825]),
which is sufficient for the current schedulers.
If we're adding the contract back with the set of containers, the
[semantics|https://issues.apache.org/jira/browse/YARN-45?focusedCommentId=13628950&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13628950]
we discussed earlier still seem OK.
> Scheduler feedback to AM to release containers
> ----------------------------------------------
>
> Key: YARN-45
> URL: https://issues.apache.org/jira/browse/YARN-45
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Chris Douglas
> Assignee: Carlo Curino
> Attachments: YARN-45.patch, YARN-45.patch, YARN-45.patch,
> YARN-45.patch, YARN-45.patch, YARN-45_summary_of_alternatives.pdf
>
>
> The ResourceManager strikes a balance between cluster utilization and strict
> enforcement of resource invariants in the cluster. Individual allocations of
> containers must be reclaimed- or reserved- to restore the global invariants
> when cluster load shifts. In some cases, the ApplicationMaster can respond to
> fluctuations in resource availability without losing the work already
> completed by that task (MAPREDUCE-4584). Supplying it with this information
> would be helpful for overall cluster utilization [1]. To this end, we want to
> establish a protocol for the RM to ask the AM to release containers.
> [1] http://research.yahoo.com/files/yl-2012-003.pdf
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