Sunil G created YARN-6538:
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Summary: Inter Queue preemption is not happening when DRF is
configured
Key: YARN-6538
URL: https://issues.apache.org/jira/browse/YARN-6538
Project: Hadoop YARN
Issue Type: Bug
Components: scheduler preemption
Affects Versions: 2.8.0
Reporter: Sunil G
Assignee: Sunil G
Cluster capacity of <memory:3TB, vCores:168>. Here memory is more and vcores
are less. If applications have more demand, vcores might be exhausted.
Inter queue preemption ideally has to be kicked in once vcores is over
utilized. However preemption is not happening.
Analysis:
In {{AbstractPreemptableResourceCalculator.computeFixpointAllocation}},
{code}
// assign all cluster resources until no more demand, or no resources are
// left
while (!orderedByNeed.isEmpty() && Resources.greaterThan(rc, totGuarant,
unassigned, Resources.none())) {
{code}
will loop even when vcores are 0. Hence we are having more vcores in
idealAssigned which cause no-preemption cases.
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