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https://issues.apache.org/jira/browse/YARN-11736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17890324#comment-17890324
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ASF GitHub Bot commented on YARN-11736:
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TaoYang526 opened a new pull request, #7121:
URL: https://github.com/apache/hadoop/pull/7121
### Description of PR
Please refer to JIRA: YARN-11736
### How was this patch tested?
UT
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> Enhance MultiNodeLookupPolicy to allow configuration of extended comparators
> for better usability.
> --------------------------------------------------------------------------------------------------
>
> Key: YARN-11736
> URL: https://issues.apache.org/jira/browse/YARN-11736
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: multi-node-placement
> Reporter: Tao Yang
> Assignee: Tao Yang
> Priority: Major
>
> Currently when multi-nodes is enabled, there is only 1 implementation of
> _MultiNodeLookupPolicy_ interface: {_}ResourceUsageMultiNodeLookupPolicy{_},
> which will sort nodes by allocated resources in ascending order.
> If cluster has nodes with different resource-spec, the resource utilization
> of smaller nodes will be significantly high, while larger nodes will
> experience low resource utilization. This may rise the hotspot risk and
> reduce the scheduling effectiveness.
> So I propose to add a new policy called _EnhancedMultiNodeLookupPolicy_ to
> meet requirements from some complex scenarios, which should contains serveral
> inherit comparators and can be extended later, and supports configuring
> specified comparators for different policy instances.
>
> {*}Implementation Details{*}:
> 1. _MultiNodeSorter#initPolicy_ will pass the policyConf which is cloned from
> scheduler configuration and attached the name of current policy, so that we
> can fetch the specified configuration for this policy inside the
> implementations of MultiNodeLookupPolicy.
> 2. new implementation of {_}MultiNodeLookupPolicy{_}:
> _EnhancedMultiNodeLookupPolicy_
> 2.1) contains several inherit comparators and can be extendable later.
> comparator keys: _ALLOCATED_RESOURCE / UNALLOCATED_RESOURCE /
> DOMINANT_RESOURCE_RATIO / NODE_ID,_ order-directions: _ASC / DESC._
> 2.2) supports configuring specified comparators with
> order-direction(ASC/DESC) for different policy instances via conf-key:
> {+}{color:#172b4d}yarn.scheduler.capacity.multi-node-sorting.policy.<policy-name>.comparators{color}{+},
> value format is
> "<comparator_key_1>[:<order_direction_1>],<comparator_key_2>[:<order_direction_2>],...".
> For example, "DOMINANT_ALLOCATED_RATIO,NODE_ID:DESC" means that for policy
> test, nodes should be sorted by dominant-resource-ratio in ascending order,
> by nodeID desc in descending order.
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