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https://issues.apache.org/jira/browse/YARN-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13744583#comment-13744583
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Omkar Vinit Joshi commented on YARN-1076:
-----------------------------------------
Hi [~maysamyabandeh] did you see this issue by code walk through? or you faced
this in your cluster? related YARN-957 ?
> RM gets stuck with a reservation, ignoring new containers
> ---------------------------------------------------------
>
> Key: YARN-1076
> URL: https://issues.apache.org/jira/browse/YARN-1076
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Reporter: Maysam Yabandeh
> Priority: Minor
>
> LeafQueue#assignContainers rejects newly available containers if
> #needContainers returns false:
> {code:java}
> if (!needContainers(application, priority, required)) {
> continue;
> }
> {code}
> When the application has already reserved all the required containers,
> #needContainers returns false as long as no starvation is reported:
> {code:java}
> return (((starvation + requiredContainers) - reservedContainers) > 0);
> {code}
> where starvation is computed based on the attempts on re-reserving a
> resource. On the other hand, a resource is re-reserved via
> #assignContainersOnNode only if it passed the #needContainers precondition:
> {code:java}
> // Do we need containers at this 'priority'?
> if (!needContainers(application, priority, required)) {
> continue;
> }
> //.
> //.
> //.
>
> // Try to schedule
> CSAssignment assignment =
> assignContainersOnNode(clusterResource, node, application,
> priority,
> null);
> {code}
> In other words, once needContainers returns false due to a reservation, it
> keeps rejecting newly available resources, since no reservation is ever
> attempted.
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