Rohit Agarwal created YARN-3633:

             Summary: With Fair Scheduler, cluster can logjam when there are 
too many queues
                 Key: YARN-3633
             Project: Hadoop YARN
          Issue Type: Bug
          Components: fairscheduler
    Affects Versions: 2.6.0
            Reporter: Rohit Agarwal
            Assignee: Rohit Agarwal
            Priority: Critical

It's possible to logjam a cluster by submitting many applications at once in 
different queues.

For example, let's say there is a cluster with 20GB of total memory. Let's say 
4 users submit applications at the same time. The fair share of each queue is 
5GB. Let's say that maxAMShare is 0.5. So, each queue has at most 2.5GB memory 
for AMs. If all the users requested AMs of size 3GB - the cluster logjams. 
Nothing gets scheduled even when 20GB of resources are available.

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