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https://issues.apache.org/jira/browse/YARN-2393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14099082#comment-14099082
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Ashwin Shankar commented on YARN-2393:
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Thanks [~ywskycn]. More comments :
1. Currently maxAMResource is bounded by instantaneous fair share. The
implication is that, a queue may suddenly get 100% instantaneous fair share,
which could all be consumed by AM containers. Should we bound maxAMResource by
steady fair share instead, which doesn't fluctuate ?
{code}
public boolean canRunAppAM(Resource amResource) {
float maxAMShare =
scheduler.getAllocationConfiguration().getQueueMaxAMShare(getName());
if (Math.abs(maxAMShare - -1.0f) < 0.0001) {
return true;
}
Resource maxAMResource = Resources.multiply(getFairShare(), maxAMShare);
Resource ifRunAMResource = Resources.add(amResourceUsage, amResource);
return !policy
.checkIfAMResourceUsageOverLimit(ifRunAMResource, maxAMResource);
}
{code}
2. Do you plan to do the "displaying of steady fair share on UI" in a different
jira ?
> Fair Scheduler : Implement static fair share
> --------------------------------------------
>
> Key: YARN-2393
> URL: https://issues.apache.org/jira/browse/YARN-2393
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Reporter: Ashwin Shankar
> Assignee: Wei Yan
> Attachments: YARN-2393-1.patch, YARN-2393-2.patch, YARN-2393-3.patch
>
>
> Static fair share is a fair share allocation considering all(active/inactive)
> queues.It would be shown on the UI for better predictability of finish time
> of applications.
> We would compute static fair share only when needed, like on queue creation,
> node added/removed. Please see YARN-2026 for discussions on this.
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