Thomas Graves created YARN-270:
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Summary: RM scheduler event handler thread gets behind
Key: YARN-270
URL: https://issues.apache.org/jira/browse/YARN-270
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager
Affects Versions: 0.23.5
Reporter: Thomas Graves
We had a couple of incidents on a 2800 node cluster where the RM scheduler
event handler thread got behind processing events and basically become
unusable. It was still processing apps, but taking a long time (1 hr 45
minutes) to accept new apps. this actually happened twice within 5 days.
We are using the capacity scheduler and at the time had between 400 and 500
applications running. There were another 250 apps that were in the SUBMITTED
state in the RM but the scheduler hadn't processed those to put in pending
state yet. We had about 15 queues none of them hierarchical. We also had
plenty of space lefts on the cluster.
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