| commit | 0bf5bbd90f3fd702fc838d9a144b599ad0490c4d | [log] [tgz] |
|---|---|---|
| author | jmmv <jmmv@google.com> | Thu Sep 19 07:48:24 2019 -0700 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu Sep 19 07:49:14 2019 -0700 |
| tree | 184119c52ab11719e41271e326b29d71a93547c9 | |
| parent | a628e786b380e4ba96316e8458b5702e8e4ba578 [diff] |
Make the dynamic spawn scheduler use cross-cancellation between spawns. This modifies the dynamic spawn scheduler so that each pair of concurrent spawns has the ability to explicitly cancel its corresponding spawn as desired, without relying on each spawn to abort execution before writing to the output tree. This is necessary so that we can later allow the remote branch of the spawn to interrupt the local branch -- but only once all artifacts have been downloaded. Such feature will come later. This change is very intrusive to the point where I consider it a different implementation of the DynamicSpawnStrategy with possible new concurrency bugs. As a result, I'm keeping the old implementation around behind a --legacy_spawn_scheduler flag (which defaults to true for now to preserve the old behavior). The goal is, of course, to remove the legacy implementation once we are confident with the new one. As a side-effect, the changes in how exceptions are handled allow crashes to propagate properly through the dynamic scheduler. They were previously being coerced into ExecException, which made debugging more difficult. RELNOTES: None. PiperOrigin-RevId: 270039481
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