Implement asynchronous glob prefetching to specifically prefetch the globs() of
a file.

There is currently a mechanism in Bazel to asynchronously go off and prefetch
file system content, specifically by recursively reading subdirectories up to
maxDirectoriesToEagerlyVisitInGlobbing. This is started when the first glob in
a file is found. It is useful to warm up caches in networked filesystems, but
doesn't actually help evaluating the globs().  As it can create extra load on
the filesystem, it can actually make evaluation slower. Moreover, it implicitly
relies on the fact that in common packages, most files are actually read into
globs() in some way, which isn't always the case.

Instead, we can visit a build file's AST and eagerly try to explicitly extract
globs that should be visited. This change is doing that if
maxDirectoriesToEagerlyVisitInGlobbing is set to a sentinal value of -2. The
visitor cannot understand all globs, e.g. when some of the pattern strings are
constructed from complex expression, but the majority of globs is explicitly
spelled out.

RELNOTES: None.
PiperOrigin-RevId: 234751342
2 files changed
tree: a6c05d9694e21bf8299aefaec6f36c04604a423b
  1. .bazelci/
  2. .gitattributes
  3. .gitignore
  4. AUTHORS
  5. BUILD
  6. CHANGELOG.md
  7. CODEOWNERS
  8. CONTRIBUTING.md
  9. CONTRIBUTORS
  10. ISSUE_TEMPLATE.md
  11. LICENSE
  12. README.md
  13. WORKSPACE
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. distdir.bzl
  18. examples/
  19. scripts/
  20. site/
  21. src/
  22. third_party/
  23. tools/
README.md

Bazel

{Fast, Correct} - Choose two

Build and test software of any size, quickly and reliably.

  • Speed up your builds and tests: Bazel only rebuilds what is necessary. With advanced local and distributed caching, optimized dependency analysis and parallel execution, you get fast and incremental builds.

  • One tool, multiple languages: Build and test Java, C++, Android, iOS, Go, and a wide variety of other language platforms. Bazel runs on Windows, macOS, and Linux.

  • Scalable: Bazel helps you scale your organization, codebase, and continuous integration solution. It handles codebases of any size, in multiple repositories or a huge monorepo.

  • Extensible to your needs: Easily add support for new languages and platforms with Bazel's familiar extension language. Share and re-use language rules written by the growing Bazel community.

Getting Started

Documentation

Contributing to Bazel

See CONTRIBUTING.md

Build status

Bazel is released in ‘Beta’. See the product roadmap to learn about the path toward a stable 1.0 release.