ryukobayashi opened a new pull request, #8523:
URL: https://github.com/apache/hadoop/pull/8523
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### Description of PR
YARN RM can transiently report negative available resources (e.g.
cluster_capacity - allocated goes negative due to overload or node failures).
`DefaultAMSProcessor` now applies `Resources.componentwiseMax` with
`Resources.none()` before setting available resources in `AllocateResponse`,
ensuring the AM always receives a non-negative value.
This is a re-implementation of YARN-11964 (reverted in #8519). The previous
fix applied the clamp inside `Resource.castToIntSafely()`, which was too broad
and caused a regression in `TestRLESparseResourceAllocation`. This fix applies
the clamp at the correct layer — in `DefaultAMSProcessor` where the
`AllocateResponse` is built.
Contains content generated by Claude (Anthropic)
### How was this patch tested?
- Added `TestDefaultAMSProcessor#testAvailableResourcesClampedToNonNegative`
which uses a custom scheduler that returns a negative resource limit and
verifies the `AllocateResponse` always contains non-negative available
resources.
- Existing tests pass: `TestApplicationMasterServiceCapacity`,
`TestApplicationMasterServiceFair`, `TestApplicationMasterServiceInterceptor`,
`TestRLESparseResourceAllocation`.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [x] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [x] 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)?
- [x] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
### AI Tooling
- [x] The PR includes the phrase "Contains content generated by Claude
(Anthropic)"
- [x] My use of AI contributions follows the ASF legal policy
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