Rohit Agarwal created YARN-3633:
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Summary: With Fair Scheduler, cluster can logjam when there are
too many queues
Key: YARN-3633
URL: https://issues.apache.org/jira/browse/YARN-3633
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.6.0
Reporter: Rohit Agarwal
Assignee: Rohit Agarwal
Priority: Critical
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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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