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https://issues.apache.org/jira/browse/YARN-11704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17865292#comment-17865292
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ASF GitHub Bot commented on YARN-11704:
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zuston opened a new pull request, #6940:
URL: https://github.com/apache/hadoop/pull/6940
### Description of PR
After applying the placement constraint allocator in our internal cluster, I
found some hotpoint that will effect the scheduling performance as the
allocation time metric value increase a lot.
After dumping the flamegraph, the hotpoint is that the
`SingleConstraintAppPlacementAllocator.checkCardinalityAndPending`, this should
be optimized by like cache or other ways. But the unnecessary nested AND
placement constraint may be a small improvement for this case.
### How was this patch tested?
### For code changes:
- [ ] 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?
> Avoid nested 'AND' placement constraint for non tags in scheduling request
> --------------------------------------------------------------------------
>
> Key: YARN-11704
> URL: https://issues.apache.org/jira/browse/YARN-11704
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacity scheduler
> Reporter: Junfan Zhang
> Assignee: Junfan Zhang
> Priority: Major
>
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