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https://issues.apache.org/jira/browse/YARN-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650246#comment-13650246
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Bikas Saha commented on YARN-45:
--------------------------------
Overall, the approach looks good.
Would be great if you could add a version number to your patches.
The javadoc is trying to help by giving more information. However, if I think
from the perspective of someone who doesnt understand YARN, RM, scheduling and
preemption, the javadoc would be hard to understand. Can we re-write this wrt
perspective of the user of the API. How are they supposed to interpret this
data. What needs to be done by them.
{code}
+ /**
+ * Get the description of containers owned by the AM, but requested back by
+ * the cluster. Note that the RM may have an inconsistent view of the
+ * resources owned by the AM. The AM may elect to ignore some or all
requests.
+ *
+ * The message is a snapshot of the resources the RM wants back from the AM.
+ * While demand persists, the RM will sustain its ask. Resources requested
+ * consistently over some duration may be forcibly killed by the RM.
{code}
In general, the javadocs and class names are a little hard for me to
understand, but it just might be me :)
> 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.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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