Force output checking for incremental run commands without the bytes. #20853
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When building without the bytes, outputs are only materialized when either (1) an action prefetches them, or (2) they've been explicitly requested. When both --remote_download_minimal and --noexperimental_check_output_files are set, this presents a problem for a build command followed by a run command for the same target: the build command won't download the outputs and the run command won't check for their presence, proceeding without them. A non-incremental run command works, because the outputs are considered top-level even in minimal mode. This is only a problem for a run command because it exists outside of action execution, and doesn't get a chance to prefetch inputs; it would have been better to implement the run command by injecting a specially crafted action into the build graph, but that will have to wait for another day. The present fix might theoretically slow things down if output checking is truly unnecessary, but I doubt that would cause a significant regression in practice. Fixes bazelbuild#20843.
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Jan 11, 2024
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| if (!modifiedOutputFiles.treatEverythingAsDeleted() && !request.getCommandName() | ||
| .equals("run")) { |
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I don't think I can make the check narrower, because the remote options can change between builds without invalidating the Skyframe state. (But maybe you can see a way.)
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When building without the bytes, outputs are only materialized when either (1) an action prefetches them, or (2) they've been explicitly requested. When both --remote_download_minimal and --noexperimental_check_output_files are set, this presents a problem for a build command followed by a run command for the same target: the build command won't download the outputs and the run command won't check for their presence, proceeding without them. A non-incremental run command works, because the outputs are considered top-level even in minimal mode. This is only a problem for a run command because it exists outside of action execution, and doesn't get a chance to prefetch inputs; it would have been better to implement the run command by injecting a specially crafted action into the build graph, but that will have to wait for another day. The present fix might theoretically slow things down if output checking is truly unnecessary, but I doubt that would cause a significant regression in practice. Fixes bazelbuild#20843. Closes bazelbuild#20853. PiperOrigin-RevId: 597909909 Change-Id: I66aedef4994fbda41fe5378c80940fa8ba637bfd
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…e bytes. (#20881) When building without the bytes, outputs are only materialized when either (1) an action prefetches them, or (2) they've been explicitly requested. When both --remote_download_minimal and --noexperimental_check_output_files are set, this presents a problem for a build command followed by a run command for the same target: the build command won't download the outputs and the run command won't check for their presence, proceeding without them. A non-incremental run command works, because the outputs are considered top-level even in minimal mode. This is only a problem for a run command because it exists outside of action execution, and doesn't get a chance to prefetch inputs; it would have been better to implement the run command by injecting a specially crafted action into the build graph, but that will have to wait for another day. The present fix might theoretically slow things down if output checking is truly unnecessary, but I doubt that would cause a significant regression in practice. Fixes #20843. Closes #20853. Commit 2f899ef PiperOrigin-RevId: 597909909 Change-Id: I66aedef4994fbda41fe5378c80940fa8ba637bfd Co-authored-by: Tiago Quelhas <tjgq@google.com>
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When building without the bytes, outputs are only materialized when either (1) an action prefetches them, or (2) they've been explicitly requested. When both --remote_download_minimal and --noexperimental_check_output_files are set, this presents a problem for a build command followed by a run command for the same target: the build command won't download the outputs and the run command won't check for their presence, proceeding without them. A non-incremental run command works, because the outputs are considered top-level even in minimal mode. This is only a problem for a run command because it exists outside of action execution, and doesn't get a chance to prefetch inputs; it would have been better to implement the run command by injecting a specially crafted action into the build graph, but that will have to wait for another day. The present fix might theoretically slow things down if output checking is truly unnecessary, but I doubt that would cause a significant regression in practice. Fixes bazelbuild#20843. Closes bazelbuild#20853. PiperOrigin-RevId: 597909909 Change-Id: I66aedef4994fbda41fe5378c80940fa8ba637bfd
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…e bytes. (#20988) When building without the bytes, outputs are only materialized when either (1) an action prefetches them, or (2) they've been explicitly requested. When both --remote_download_minimal and --noexperimental_check_output_files are set, this presents a problem for a build command followed by a run command for the same target: the build command won't download the outputs and the run command won't check for their presence, proceeding without them. A non-incremental run command works, because the outputs are considered top-level even in minimal mode. This is only a problem for a run command because it exists outside of action execution, and doesn't get a chance to prefetch inputs; it would have been better to implement the run command by injecting a specially crafted action into the build graph, but that will have to wait for another day. The present fix might theoretically slow things down if output checking is truly unnecessary, but I doubt that would cause a significant regression in practice. Fixes #20843. Closes #20853. Commit 2f899ef PiperOrigin-RevId: 597909909 Change-Id: I66aedef4994fbda41fe5378c80940fa8ba637bfd Co-authored-by: Tiago Quelhas <tjgq@google.com>
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@tjgq This change slows down our bazel run invocations by 5 seconds compared to bazel build. I think your theoretical case of switching remote options between builds will be very uncommon in practice, where these settings are pinned in the .bazelrc. Could you reconsider narrowing down the check to also return NOTHING_MODIFIED when remote download is set to all? This would allow us to speed up common dev tasks by 5 seconds. |
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When building without the bytes, outputs are only materialized when either (1) an action prefetches them, or (2) they've been explicitly requested. When both --remote_download_minimal and --noexperimental_check_output_files are set, this presents a problem for a build command followed by a run command for the same target: the build command won't download the outputs and the run command won't check for their presence, proceeding without them. A non-incremental run command works, because the outputs are considered top-level even in minimal mode.
This is only a problem for a run command because it exists outside of action execution, and doesn't get a chance to prefetch inputs; it would have been better to implement the run command by injecting a specially crafted action into the build graph, but that will have to wait for another day. The present fix might theoretically slow things down if output checking is truly unnecessary, but I doubt that would cause a significant regression in practice.
Fixes #20843.