Meng Zhu created MESOS-8352:
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Summary: Resources may get over allocated to some roles while fail
to meet the quota of other roles.
Key: MESOS-8352
URL: https://issues.apache.org/jira/browse/MESOS-8352
Project: Mesos
Issue Type: Bug
Components: allocation
Reporter: Meng Zhu
Assignee: Meng Zhu
In the quota role allocation stage, if a role gets some resources on an agent
to meet its quota, it will also get all other resources on the same agent that
it does not have quota for. This may starve roles behind it that have quotas
set for those resources.
To fix that, we need to track quota headroom in the quota role allocation
stage. In that stage, if a role has no quota set for a scalar resource, it will
get that resource only when two conditions are both met:
- It got some other resources on the same agent to meet its quota; And
- After allocating those resources, quota headroom is still above the required
amount.
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