[Upstream Breaking Change] NIXL 0.9.0 → 0.10.0 - Device API V2

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Summary

NIXL 0.10.0 has been released with breaking Device API V2 changes. The current pin is 0.9.0 in docker/Dockerfile.cuda line 46.

Breaking API Changes

Device API V2 Redesign (HIGH)

The Device API has been completely redesigned with new interfaces for host-side and device-side operations. This is a significant breaking change from the v1 Device API.

Changes include:

• New API definition and interface updates (#1229)
• New core host-side implementation (#1230)
• New UCX backend implementation (#1245)
• New GPU and UCX device-side implementation (#1255)
• New memory view API that simplifies device initialization

Impact: Any code using the NIXL Device API v1 will break and require refactoring to Device API V2.

Files Affected

Per docs/upstream-versions.md, NIXL is pinned in:

• docker/Dockerfile.cuda line 46: NIXL_VERSION=0.9.0

Additional Notable Changes

New Features

• AWS Neuron device support (Trainium/Inferentia)
• Azure Blob Storage plugin
• S3 CRT client support with automatic multipart parallelism
• Hierarchical object storage architecture (S3, CRT-S3, future RDMA S3)
• Libfabric Slingshot/CXI provider support

Performance Improvements

• Python GIL release in time-consuming functions
• Libfabric CQ batch reads (16 entries) and improved threading model
• UCX RC GDA multi-channel configuration

Recommended Actions

1. Review API migration guide if available in NIXL 0.10.0 documentation
2. Search for Device API usage in llm-d codebase:

   grep -r "nixl.*device" . --include="*.py" --include="*.cu" --include="*.cpp"

3. Update Dockerfile to pin 0.10.0:

   ENV NIXL_VERSION=0.10.0

4. Refactor Device API calls to use V2 interfaces if currently using V1
5. Test thoroughly - API redesigns can surface unexpected edge cases

Impact

HIGH - Breaking API changes require code modifications. However, impact is limited to code that uses NIXL's Device API directly.

Upstream References

• Release: https://github.com/ai-dynamo/nixl/releases/tag/0.10.0
• Full Changelog: ai-dynamo/nixl@0.9.0...0.10.0
• Device API V2 PRs: #1229, #1230, #1245, #1255

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