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epriestley 32942f6232 Introduce storage patch "phases" to allow index-rebuilding patches to execute after worker queue schema changes
Summary:
Ref T13591. Some storage patches queue worker tasks, currently always to rebuild search indexes.

These patches can not execute in creation order if a later patch modifies the worker task table, since they'll try to perform a modern INSERT against an out-of-date table schema. Such a modification is desirable in the context of T13591, but making it causes these patches to fail.

Patches have an existing "after" mechanism which allows them to have explicit dependencies. This mechanism could be used to resolve this issue, but all patches with a dependency like this would need to be updated every time the queue table changes.

Instead, introduce "phases" to provide broader ordering rules. There are now two phases: "default" and "worker". Patches in the "worker" phase execute after patches in the "default" phase.

Phases may eventually be further separated, but

Test Plan:
  - Ran `bin/storage status`, saw patches annotated with phases.
  - Will apply `containerPHID` changes on top of this.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13591

Differential Revision: https://secure.phabricator.com/D21529
2021-02-02 13:40:09 -08:00
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