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https://issues.apache.org/jira/browse/YARN-4822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan updated YARN-4822:
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Description:
Currently, ProportionalCapacityPreemptionPolicy has hard coded logic to select
candidates to be preempted (based on FIFO order of applications/containers).
It's not a simple to add new candidate-selection logics, such as preemption for
large container, intra-queeu fairness/policy, etc.
In this JIRA, I propose to do following changes:
1) Cleanup code bases, consolidate current logic into 3 stages:
- Compute ideal sharing of queues
- Select to-be-preempt candidates
- Send preemption/kill events to scheduler
2) Add a new interface: {{PreemptionCandidatesSelectionPolicy}} for above
"select to-be-preempt candidates" part. Move existing how to select candidates
logics to {{FifoPreemptionCandidatesSelectionPolicy}}.
3) Allow multiple PreemptionCandidatesSelectionPolicies work together in a
chain. Preceding PreemptionCandidatesSelectionPolicy has higher priority to
select candidates, and later PreemptionCandidatesSelectionPolicy can make
decisions according to already selected candidates and pre-computed queue ideal
shares of resources.
was:Currently, ProportionalCapacityPreemptionPolicy has hard coded logic to
select candidates to be preempted. This is not
> Refactor existing Preemption Policy of CS for easier adding new approach to
> select preemption candidates
> --------------------------------------------------------------------------------------------------------
>
> Key: YARN-4822
> URL: https://issues.apache.org/jira/browse/YARN-4822
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Wangda Tan
> Assignee: Wangda Tan
>
> Currently, ProportionalCapacityPreemptionPolicy has hard coded logic to
> select candidates to be preempted (based on FIFO order of
> applications/containers). It's not a simple to add new candidate-selection
> logics, such as preemption for large container, intra-queeu fairness/policy,
> etc.
> In this JIRA, I propose to do following changes:
> 1) Cleanup code bases, consolidate current logic into 3 stages:
> - Compute ideal sharing of queues
> - Select to-be-preempt candidates
> - Send preemption/kill events to scheduler
> 2) Add a new interface: {{PreemptionCandidatesSelectionPolicy}} for above
> "select to-be-preempt candidates" part. Move existing how to select
> candidates logics to {{FifoPreemptionCandidatesSelectionPolicy}}.
> 3) Allow multiple PreemptionCandidatesSelectionPolicies work together in a
> chain. Preceding PreemptionCandidatesSelectionPolicy has higher priority to
> select candidates, and later PreemptionCandidatesSelectionPolicy can make
> decisions according to already selected candidates and pre-computed queue
> ideal shares of resources.
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