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Peng Zhang updated YARN-3405: ----------------------------- Description: Queue hierarchy described as below: {noformat} root / \ queue-1 queue-2 / \ queue-1-1 queue-1-2 {noformat} Assume cluster resource is 100 # queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare. # When queue-1-2 is active, and it cause some new preemption request for fairshare 25. # When preemption from root, it has possibility to find preemption candidate is queue-2. If so preemptContainerPreCheck for queue-2 return false because it's equal to its fairshare. # Finally queue-1-2 will be waiting for resource release form queue-1-1 itself. What I expect here is that queue-1-2 preempt from queue-1-1. was: Queue hierarchy described as below: {noformat} root / \ queue-1 queue-2 / \ queue-1-1 queue-1-2 {noformat} Assume cluster resource is 100 # queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare. # When queue-1-2 is active, and it cause some new preemption request for fairshare 25. # When preemption from root, it has possibility to find preemption candidate is queue-2. If so preemptContainerPreCheck for queue-2 return false because it's equal to its fairshare. # Finally queue-1-2 will be waiting for resource release form queue-1-1 itself. What I expect here is that queue-1-2 preempt from queue-1-1. > FairScheduler's preemption cannot happen between sibling in some case > --------------------------------------------------------------------- > > Key: YARN-3405 > URL: https://issues.apache.org/jira/browse/YARN-3405 > Project: Hadoop YARN > Issue Type: Bug > Components: fairscheduler > Affects Versions: 2.7.0 > Reporter: Peng Zhang > Priority: Critical > > Queue hierarchy described as below: > {noformat} > root > / \ > queue-1 queue-2 > / \ > queue-1-1 queue-1-2 > {noformat} > Assume cluster resource is 100 > # queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare. > # When queue-1-2 is active, and it cause some new preemption request for > fairshare 25. > # When preemption from root, it has possibility to find preemption candidate > is queue-2. If so preemptContainerPreCheck for queue-2 return false because > it's equal to its fairshare. > # Finally queue-1-2 will be waiting for resource release form queue-1-1 > itself. > What I expect here is that queue-1-2 preempt from queue-1-1. -- This message was sent by Atlassian JIRA (v6.3.4#6332)