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We use hg.m.o's `json-automationrelevance` endpoint for a variety of reasons such as getting the files changed for optimization purposes, or finding the base revision for diff purposes. But this endpoint is slow and puts undue load on hg.mozilla.org if queried too often. The helper function that fetches this is memoized, so in theory we should only ever make this request once per graph generation. However, there are still cases where we request this unnecessarily: 1. When running `./mach taskgraph` locally, we first fetch `json-automationrelevance` and then fall back to fetching it locally if the revision wasn't found. I believe the reason for this is to be able to generate identical graphs as produced by CI. 2. When specifying multiple parameters (so graphs are generated in parallel), the memoize won't cache across processes, so we make the request once per parameter set. 3. Any other time we generate tasks outside the context of a Decision task (e.g `./mach try`), as there are transforms that call this function. By turning `files_changed` into a parameter, we can ensure that this value gets "frozen" by the Decision task and it will never need to be recomputed. E.g, you could use `-p task-id=<decision id>` and you'd still get the `files_changed` value that Decision task computed. This means, that for all non-Decision use cases we can rely on local VCS to give us our changed files. This should greatly cut back on the number of queries being made to `hg.m.o`. Differential Revision: https://phabricator.services.mozilla.com/D204127 |
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| .. | ||
| howto | ||
| img | ||
| kinds | ||
| optimization | ||
| transforms | ||
| attributes.rst | ||
| balrog.rst | ||
| caches.rst | ||
| config.rst | ||
| cron.rst | ||
| index.rst | ||
| kinds.rst | ||
| parameters.rst | ||
| partials.rst | ||
| partner-attribution.rst | ||
| partner-repacks.rst | ||
| platforms.rst | ||
| reference.rst | ||
| release-promotion-action.rst | ||
| release-promotion.rst | ||
| signing.rst | ||
| taskgraph.rst | ||
| try.rst | ||
| using-the-mozilla-source-server.rst | ||
| versioncontrol.rst | ||