[ARROW-8648] [Rust] Optimize Rust CI Build Times

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: Rust
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/24809
• Assignee: Mark Hildreth
• Reporter: Mark Hildreth
• Created: 30/Apr/20 14:45
• Updated: 11/Jan/23 08:01
• Resolved: 30/Apr/20 18:56

Description

In the Rust CI workflows (rust_build.sh, rust_test.sh), there are some build options used that are at odds with each other, resulting in multiple redundant builds where a smaller number could do the same job. The following tweaks, at minimal, could reduce this, speeding up build times:

• Ensure that RUSTFLAGS="-D warnings" is used for all cargo commands. Currently, it's only used for a single command (the build --all-targets in rust_build.sh). Subsuquent runs of cargo will ignore this first build, since RUSTFLAGS has changed.
• Don't run examples in release mode, as that would force a new (and slower) rebuild, when the examples have already been built in debug mode.

Issue Links

• links to: GitHub Pull Request #7072