[8.4.1] Speculative fix for repo contents cache race #26950
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The error message observed in bazelbuild#26713 is consistent with `FileChannel#open` failing because the given path doesn't exist. This could happen if one Bazel process observed that `!entryDir.isDirectory()`, which is true if the path doesn't exist, and proceeded to delete the path while another process had just created the directory and is now opening the channel. Since the entry dir is never expected to be an existing non-directory unless the cache has been corrupted, this logic can be removed. Another possible source of `IOException` during normal operation is on an interrupt (such as the user hitting Ctrl+C). Instead, follow Skyframe best practices by surfacing this as an `InterruptedException` instead of a `FileLockInterruptionException`. Also document that concurrent use on the same path is not supported (it results in an `OverlappingFileLockException` if the lock is already held, regardless of whether that is in shared or exclusive mode) and why the current usages are safe. Fixes bazelbuild#26713 Closes bazelbuild#26914. PiperOrigin-RevId: 805338728 Change-Id: Ie808ebe6113b935180b93c21679d5398aa168802
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### Motivation See: - https://github.com/bazelbuild/bazel/releases/tag/8.4.0 - https://github.com/bazelbuild/bazel/releases/tag/8.4.1 - https://github.com/bazelbuild/bazel/releases/tag/8.4.2 (8.5.0 is due soon) #### Cache & reliability - 8.4.0 honors XDG_CACHE_HOME on macOS, which will definitely help ([ABLD-300](https://datadoghq.atlassian.net/browse/ABLD-300)): bazelbuild/bazel#26773 - 8.4.1 fixes a race condition affecting repository contents cache: bazelbuild/bazel#26950 - 8.4.0 fixes another race condition affecting workers: bazelbuild/bazel#26475 #### Modules - 8.4.0 brings new `--module_mirrors` flag for fallback URLs when primary sources are slow/unavailable: bazelbuild/bazel#26850 - 8.4.0 avoids the need for dummy `MODULE.bazel` files with `git_repository`/`http_archive`: bazelbuild/bazel#26462 - 8.4.2 fixes a maintenance annoyance for `MODULE.bazel.lock` file: bazelbuild/bazel#27111 #### Platforms - 8.4.0 allows to mitigate the long path issue with **MSVC on Windows**: bazelbuild/bazel#26532 - 8.4.2 fixes **macOS** compatibility issues: bazelbuild/bazel#27014 [ABLD-300]: https://datadoghq.atlassian.net/browse/ABLD-300?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ Co-authored-by: regis.desgroppes <[email protected]>
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### Motivation See: - https://github.com/bazelbuild/bazel/releases/tag/8.4.0 - https://github.com/bazelbuild/bazel/releases/tag/8.4.1 - https://github.com/bazelbuild/bazel/releases/tag/8.4.2 (8.5.0 is due soon) #### Cache & reliability - 8.4.0 honors XDG_CACHE_HOME on macOS, which will definitely help ([ABLD-300](https://datadoghq.atlassian.net/browse/ABLD-300)): bazelbuild/bazel#26773 - 8.4.1 fixes a race condition affecting repository contents cache: bazelbuild/bazel#26950 - 8.4.0 fixes another race condition affecting workers: bazelbuild/bazel#26475 #### Modules - 8.4.0 brings new `--module_mirrors` flag for fallback URLs when primary sources are slow/unavailable: bazelbuild/bazel#26850 - 8.4.0 avoids the need for dummy `MODULE.bazel` files with `git_repository`/`http_archive`: bazelbuild/bazel#26462 - 8.4.2 fixes a maintenance annoyance for `MODULE.bazel.lock` file: bazelbuild/bazel#27111 #### Platforms - 8.4.0 allows to mitigate the long path issue with **MSVC on Windows**: bazelbuild/bazel#26532 - 8.4.2 fixes **macOS** compatibility issues: bazelbuild/bazel#27014 [ABLD-300]: https://datadoghq.atlassian.net/browse/ABLD-300?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ Co-authored-by: regis.desgroppes <[email protected]>
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The error message observed in #26713 is consistent with
FileChannel#openfailing because the given path doesn't exist. This could happen if one Bazel process observed that!entryDir.isDirectory(), which is true if the path doesn't exist, and proceeded to delete the path while another process had just created the directory and is now opening the channel. Since the entry dir is never expected to be an existing non-directory unless the cache has been corrupted, this logic can be removed.Another possible source of
IOExceptionduring normal operation is on an interrupt (such as the user hitting Ctrl+C). Instead, follow Skyframe best practices by surfacing this as anInterruptedExceptioninstead of aFileLockInterruptionException.Also document that concurrent use on the same path is not supported (it results in an
OverlappingFileLockExceptionif the lock is already held, regardless of whether that is in shared or exclusive mode) and why the current usages are safe.Fixes #26713
Closes #26914.
PiperOrigin-RevId: 805338728
Change-Id: Ie808ebe6113b935180b93c21679d5398aa168802
Commit ca1cbfe