Anup Agarwal created YARN-10724:
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Summary: Overcounting of preemptions in CapacityScheduler
(LeafQueue metrics)
Key: YARN-10724
URL: https://issues.apache.org/jira/browse/YARN-10724
Project: Hadoop YARN
Issue Type: Bug
Environment: One cause of the over-counting:
When a container is already running, SchedulerNode does not remove the
container immediately from launchedContainer list and waits from the NM to kill
the container.
Both NODE_RESOURCE_UPDATE and NODE_UPDATE invoke signalContainersIfOvercommited
(AbstractYarnScheduler) which look for containers to preempt based on the
launchedContainers list. Both these calls can create a ContainerPreemptEvent
for the same container (as RM is waiting for NM to kill the container). This
leads LeafQueue to log metrics for the same preemption multiple times.
Reporter: Anup Agarwal
Currently CapacityScheduler over-counts preemption metrics inside QueueMetrics.
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