Benjamin Bannier created MESOS-8950:
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Summary: Framework operations can make resources unallocatable
Key: MESOS-8950
URL: https://issues.apache.org/jira/browse/MESOS-8950
Project: Mesos
Issue Type: Bug
Components: allocation, master
Reporter: Benjamin Bannier
The allocator does not offer {{cpus}} or {{mem}} resources smaller than
certain, fixed sizes. For framework operations, we do not enforce the same
minimum size constraints which can lead the resources becoming unavailable for
any future allocations. This behavior seems most pronounced when a framework
can register in many roles.
Example:
* A single multirole framework which can register in any role, e.g., in a
certain role subhierarchy.
* Single agent with {{cpus:1.5*MIN_CPUS}} and {{mem:1.5*MIN_MEM}}.
* Framework is offered all resources and performs a {{RESERVE}} on
{{cpus:0.5*MIN_CPUS}}. It then changes its role.
* Same framework behavior in next two offer cycles. All {{cpus}} are then
reserved for different roles in unallocatable amounts.
* Last offer will be just for {{mem:1.5*MIN_MEM}}, framework reserves 0.6 of
these to another role. This fragements the {{mem}} resources as well.
* No allocatable resources left in cluster.
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