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https://issues.apache.org/jira/browse/YARN-7535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16266597#comment-16266597
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xuekang commented on YARN-7535:
-------------------------------
I understand that a queue cannot use more resource than its max resources, but
demand is not use.
The users should know how many resources their apps are requesting, and the
YARN admin should know how many extra resources should be added to the queue,
if the demand is always larger than the max resources. Now, when the demand is
larger than the max value, the demand value in the RM web UI is just a limit
instead of a real demand, which is unreasonable.
> We should display origin value of demand in fair scheduler page
> ---------------------------------------------------------------
>
> Key: YARN-7535
> URL: https://issues.apache.org/jira/browse/YARN-7535
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Reporter: YunFan Zhou
> Assignee: YunFan Zhou
>
> The value of *demand* of leaf queue that we now view on the fair scheduler
> page shows only the value of *maxResources* when the demand value is greater
> than *maxResources*. It doesn't reflect the real situation. Most of the time,
> when we expand the queue, we often rely on seeing the current demand real
> value.
> {code:java}
> private void updateDemandForApp(FSAppAttempt sched, Resource maxRes) {
> sched.updateDemand();
> Resource toAdd = sched.getDemand();
> if (LOG.isDebugEnabled()) {
> LOG.debug("Counting resource from " + sched.getName() + " " + toAdd
> + "; Total resource consumption for " + getName() + " now "
> + demand);
> }
> demand = Resources.add(demand, toAdd);
> demand = Resources.componentwiseMin(demand, maxRes);
> }
> {code}
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