Wangda Tan created YARN-8149:
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Summary: Revisit behavior of Re-Reservation in Capacity Scheduler
Key: YARN-8149
URL: https://issues.apache.org/jira/browse/YARN-8149
Project: Hadoop YARN
Issue Type: Bug
Reporter: Wangda Tan
Frankly speaking, I'm not sure why we need the re-reservation. The formula is
not that easy to understand:
Inside:
{{org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.RegularContainerAllocator#shouldAllocOrReserveNewContainer}}
{code:java}
starvation = re-reservation / (#reserved-container *
(1 - min(requested-resource / max-alloc,
max-alloc - min-alloc / max-alloc))
should_allocate = starvation + requiredContainers - reservedContainers > 0{code}
I think we should be able to remove the starvation computation, just to check
requiredContainers > reservedContainers should be enough.
In a large cluster, we can easily overflow re-reservation to MAX_INT, see
YARN-7636.
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