Forward-merge release/25.12 into main

[rapids-bot]

Forward-merge triggered by push to release/25.12 that creates a PR to keep main up-to-date. If this PR is unable to be immediately merged due to conflicts, it will remain open for the team to manually merge. See forward-merger docs for more info.

[rapids-bot]

SUCCESS - forward-merge complete.

[greptile-apps]

Greptile Overview

Greptile Summary

This forward-merge from release/25.12 integrates sccache-dist distributed build cluster support across the entire CI/CD pipeline. The changes enable faster compilation by distributing builds across a cluster and leveraging preprocessor-level caching in S3.

Key Changes:

• Added node_type: cpu8 and authentication configuration to all GitHub Actions workflows
• Updated build scripts to use sccache --stop-server instead of --zero-stats for better distributed mode handling
• Configured preprocessor cache mode (SCCACHE_S3_USE_PREPROCESSOR_CACHE_MODE=true) across all build contexts
• Added comprehensive sccache-dist environment variables with sensible defaults to conda recipes
• Disabled distributed compilation for CMake compiler tests to avoid overhead (SCCACHE_NO_DIST_COMPILE=1)
• Set appropriate timeouts (7140 seconds), retry policies (infinite retries), and error logging

Impact:
This is a infrastructure optimization that should significantly reduce build times without affecting functionality. All changes are configuration-only with no logic modifications to the codebase itself.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk - it only adds build infrastructure optimizations without changing application logic
• Score reflects that all changes are purely configuration-related for sccache-dist integration. The changes are consistent across all files, follow established patterns, include proper error handling (e.g., 2>/dev/null || true), and are standard forward-merge changes from a release branch. No application code or logic is modified.
• No files require special attention - this is a clean forward-merge of infrastructure improvements

Important Files Changed

File Analysis

Filename	Score	Overview
.github/workflows/build.yaml	5/5	Added node_type: cpu8 and sccache-dist-token-secret-name to all build jobs for distributed sccache support
.github/workflows/pr.yaml	5/5	Added node_type: cpu8 and sccache-dist-token-secret-name to all build and test jobs for distributed sccache support
ci/build_cpp.sh	5/5	Changed from sccache --zero-stats to sccache --stop-server pattern for better sccache-dist integration
ci/build_python.sh	5/5	Changed from sccache --zero-stats to sccache --stop-server pattern for better sccache-dist integration
ci/build_wheel.sh	5/5	Changed from sccache --zero-stats to sccache --stop-server and added preprocessor cache configuration for wheels
cmake/rapids_config.cmake	5/5	Added SCCACHE_NO_DIST_COMPILE=1 to disable distributed compilation for CMake compiler tests
conda/recipes/libwholegraph/recipe.yaml	5/5	Added comprehensive sccache-dist environment variables with defaults and preprocessor cache configuration
conda/recipes/pylibwholegraph/recipe.yaml	5/5	Added comprehensive sccache-dist environment variables with defaults and preprocessor cache configuration

Sequence Diagram

sequenceDiagram
    participant GH as GitHub Actions
    participant Build as Build Job
    participant Sccache as sccache-dist
    participant S3 as S3 Cache
    participant Rattler as rattler-build

    Note over GH,Rattler: sccache-dist Build Cluster Integration

    GH->>Build: Start with node_type: cpu8
    GH->>Build: Configure authentication
    
    Build->>Build: Set sccache-dist environment<br/>(timeouts, scheduler, auth type)
    Build->>Sccache: Stop existing server
    Note right of Sccache: Clean slate for new build

    Build->>Build: Enable preprocessor cache mode
    Note right of Build: SCCACHE_S3_USE_PREPROCESSOR_CACHE_MODE=true

    Build->>Rattler: Start build

    loop For each compilation
        Rattler->>Sccache: Request compilation
        Sccache->>S3: Check preprocessor cache
        alt Cache Hit
            S3-->>Sccache: Return cached result
        else Cache Miss
            Sccache->>Sccache: Compile on distributed cluster
            Sccache->>S3: Store in preprocessor cache
        end
        Sccache-->>Rattler: Return compiled object
    end

    Rattler-->>Build: Build complete
    Build->>Sccache: Show advanced stats
    Build->>Sccache: Stop server gracefully

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[greptile-apps]

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